<PAGE>   1
                                                                EXHIBIT 10.8


THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE OFFERED, SOLD OR
OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL SUCH SECURITIES
ARE REGISTERED UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE
COMPANY IS OBTAINED TO THE EFFECT THAT SUCH REGISTRATION IS NOT REQUIRED.

           THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUED UPON ITS
                   EXERCISE ARE SUBJECT TO THE RESTRICTIONS ON
                 TRANSFER SET FORTH IN SECTION 4 OF THIS WARRANT

Warrant No. ADP1                             Number of Shares:  up to 1,140,000
                                             (subject to adjustment)
Original
Date of Issuance:  January 23, 1998
Amended on: March 5, 1999

                             CAREERBUILDER, INC.

                             Amended and Restated

                        Common Stock Purchase Warrant

                         (Void after March 30, 2007)

       NetStart, Inc., a Delaware corporation (the "Company"), for value
received, hereby certifies that ADP, Inc., or its registered assigns (the
"Registered Holder"), is entitled, subject to the terms set forth below, to
purchase from the Company up to 1,140,000 shares (subject to adjustment) of
Common Stock, $.001 par value per share, of the Company, at a purchase price of
$12.00 per share for 380,000 shares to be issued under Tranche I and at a
purchase price of $5.00 per share for the shares to be issued under Tranches II
and III (subject to adjustment). The shares purchasable upon exercise of this
Warrant, and the purchase price per share, each as adjusted from time to time
pursuant to the  provisions of this Warrant, are hereinafter referred to as the
"Warrant  Shares" and the "Purchase Price," respectively.

       1.    Vesting and Exercise.

             (a)    This warrant will become exercisable ("vest") as to the
number of Warrant Shares listed in column A below if and when the total revenue
actually received by the Company pursuant to the ADP Joint
Marketing/Distribution Agreement dated January 23, 1998, by and between the
Company and ADP, Inc., as amended on March 5, 1999, equals the amount set
forth in the corresponding portion of column B below during the corresponding
period specified in column C below. Tranche I, consisting of 380,000 Warrant
Shares, will vest as of the date of this Amended and Restated Warrant.

<PAGE>   2
<TABLE>
<CAPTION>

                         A                  B                     C                    D
                     NUMBER OF             NET
                      VESTING        REVENUE RECEIVED
                  WARRANT SHARES     BY THE COMPANY             PERIOD                DATE
                  --------------    -----------------           ------               --------
<S>              <C>                <C>                    <C>                       <C>
Tranche II       180,000 - 380,000     $10,200,000         3/1/99 - 3/30/01           3/30/01

Tranche III            50,000          $23,000,000         4/1/01 - 3/30/02           3/30/02
                       75,000          $24,000,000
                      100,000          $25,000,000
                      140,000          $26,000,000
                      190,000          $27,000,000
                      230,000          $28,000,000
                      300,000          $29,000,000
                      380,000          $30,000,000
</TABLE>

The number of shares to which this Warrant vests in Tranche I and Tranche II
shall be determined ratably based on the revenue actually received by the
Company, each Tranche shall vest as of the relevant vesting date specified in
column D for that Tranche only after the minimum amount of revenue specified in
column B is actually received by the Company during the relevant period
specified in column C and each Tranche shall only be exercisable for a period of
up to five (5) years after the relevant vesting date specified in column D. In
no event shall (i) the number of shares exercisable with respect to any Tranche
exceed 380,000 shares (subject to adjustment), (ii) the total number of shares
exercisable pursuant to this Warrant exceed 1,140,000 (subject to adjustment) or
(iii) this Warrant be exercisable after April 1, 2007. Within 10 days after each
relevant vesting date the Company shall mail to the Registered Holder a
certificate setting forth for the relevant Tranche the total revenue actually
received by the Company during the relevant period and the number of Warrant
Shares, if any, then purchasable upon exercise with respect to the Tranche.

             (b)    Subject to Section 1(a), this Warrant may be exercised by
the Registered Holder, in whole or in part, by surrendering this Warrant, with
the purchase form appended hereto as Exhibit I duly executed by such Registered
Holder or by such Registered Holder's duly authorized attorney, at the principal
office of the Company, or at such other office or agency as the Company may
designate, accompanied by payment in full, in lawful money of the United States,
of the Purchase Price payable in respect of the number of Warrant Shares to be
purchased upon such exercise.

             (c)    The Registered Holder may, at its option, elect to pay
some or all of the Purchase Price payable upon an exercise of this Warrant by
cancelling a portion of this Warrant exercisable for such number of Warrant
Shares as is determined by dividing (i) the total Purchase Price payable in
respect of the number of Warrant Shares being purchased upon such exercise by
(ii) the excess of the Fair Market Value per share of Common Stock as of the
effective date of exercise, as determined pursuant to subsection 1(d) below (the
"Exercise Date") over the Purchase Price per share. If the Registered Holder
wishes to exercise this Warrant pursuant to this method of payment with respect
to the maximum number of Warrant

                                      -2-
<PAGE>   3

Shares purchasable pursuant to this method, then the number of Warrant Shares so
purchasable shall be equal to the total number of Warrant Shares, minus the
product obtained by multiplying (x) the total number of Warrant Shares by (y) a
fraction, the numerator of which shall be the Purchase Price per share and the
denominator of which shall be the Fair Market Value per share of Common Stock as
of the Exercise Date. The Fair Market Value per share of Common Stock shall be
determined as follows:

                    (i)    If the Common Stock is listed on a national
securities exchange, the NASDAQ National Market System, the NASDAQ system, or
another nationally recognized exchange or trading system as of the Exercise
Date, the Fair Market Value per share of Common Stock shall be deemed to be the
last reported sale price per share of Common Stock thereon on the Exercise Date;
or, if no such price is reported on such date, such price on the next preceding
business day (provided that if no such price is reported on the next preceding
business day, the Fair Market Value per share of Common Stock shall be
determined pursuant to clause (ii)).

                    (ii)   If the Common Stock is not listed on a national
securities exchange, the NASDAQ National Market System, the NASDAQ system or
another nationally recognized exchange or trading system as of the Exercise
Date, the Fair Market Value per share of Common Stock shall be deemed to be the
amount most recently determined by the Board of Directors to represent the fair
market value per share of the Common Stock (including without limitation a
determination for purposes of granting Common Stock options or issuing Common
Stock under an employee benefit plan of the Company); and, upon request of the
Registered Holder, the Board of Directors (or a representative thereof) shall
promptly notify the Registered Holder of the Fair Market Value per share of
Common Stock. Notwithstanding the foregoing, if the Board of Directors has not
made such a determination within the three-month period prior to the Exercise
Date, then (A) the Fair Market Value per share of Common Stock shall be the
amount next determined by the Board of Directors to represent the fair market
value per share of the Common Stock (including without limitation a
determination for purposes of granting Common Stock options or issuing Common
Stock under an employee benefit plan of the Company), (B) the Board of Directors
shall make such a determination within 15 days of a request by the Registered
Holder that it do so, and (C) the exercise of this Warrant pursuant to this
subsection 1(c) shall be delayed until such determination is made.

             (d)    Each exercise of this Warrant shall be deemed to have been
effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in subsection
1(b) above. At such time, the person or persons in whose name or names any
certificates for Warrant Shares shall be issuable upon such exercise as provided
in subsection 1(e) below shall be deemed to have become the holder or holders of
record of the Warrant Shares represented by such certificates.


                                      -3-

<PAGE>   4

             (e)    As soon as practicable after the exercise of this Warrant
in full or in part, and in any event within 20 days thereafter, the Company, at
its expense, will cause to be issued in the name of, and delivered to, the
Registered Holder, or as such Holder (upon payment by such Holder of any
applicable transfer taxes) may direct:

                    (i)    a certificate or certificates for the number of full
Warrant Shares to which such Registered Holder shall be entitled upon such
exercise plus, in lieu of any fractional share to which such Registered Holder
would otherwise be entitled, cash in an amount determined pursuant to Section 3
hereof; and

                    (ii)   in case such exercise is in part only, a new warrant
or warrants (dated the date hereof) of like tenor, calling in the aggregate on
the face or faces thereof for the number of Warrant Shares equal (without giving
effect to any adjustment therein) to the number of such Warrant Shares called
for on the face of this Warrant minus the sum of (a) the number of such Warrant
Shares purchased by the Registered Holder upon such exercise plus (b) the number
of Warrant Shares (if any) covered by the portion of this Warrant cancelled in
payment of the Purchase Price payable upon such exercise pursuant to subsection
1(c) above.

       2.    Adjustments.

             (a)    If at anytime between January 23, 1998, and April 1, 2001,
the Company sells and issues Additional Shares of Common Stock (as defined
below) primarily for financing purposes, the number of Warrant Shares
purchasable upon exercise of unvested and unexpired rights under this Warrant
shall simultaneously with the closing of the relevant transaction be increased
by a percentage that is equal to the percentage determined by dividing (i) the
number of Additional Shares of Common Stock issued in such transaction by the
(ii) Base Amount (as defined below); provided, however, that, without limiting
the generality of the foregoing, in no event shall the adjustment set forth in
this Section 2(a) apply to securities issued (A) upon conversion of any
preferred stock of the Company, (B) as a stock dividend or upon any subdivision
of shares of Common Stock, provided that the securities issued pursuant to such
stock dividend or subdivision are limited to additional shares of Common Stock,
(C) pursuant to subscriptions, warrants, options, convertible securities, or
other rights which are listed in Schedule III to the Class D Convertible
Preferred Stock Purchase Agreement dated as of September 11, 1997, as amended,
by and among the Company and the other signatories thereto (the "Purchase
Agreement") as being outstanding on September 11, 1997, (D) solely in
consideration for the acquisition (whether by merger or consolidation (where the
holders of capital stock of the Company immediately prior to such merger or
consolidation continue to hold at least 51% by voting power of the capital stock
of the surviving corporation) or otherwise) by the Company or any of its
subsidiaries of stock or assets of any other entity, provided that the Board of
Directors of the Company on or before the acquisition determines in good faith
based on pro forma financial statements prepared by the Company for the twelve
months following the acquisition that the acquisition is not dilutive (as such
term is defined

                                      -4-
<PAGE>   5

by the Company's independent certified public accountants) during the first
fiscal quarter of the Company following the expiration of the 12-month period
after the closing of the transaction or that the number of Additional Shares of
Common Stock issued to effect the acquisition is less than 10% of the then Base
Amount, (E) pursuant to a firm commitment underwritten public offering, (F)
pursuant to the exercise of the warrants issued to ADP, Inc. ("ADP") in
connection with its purchase of Class D Convertible Preferred Stock from the
Company, and (G) pursuant to the exercise of options to purchase Common Stock
granted to directors, officers, employees or consultants of the Company in
connection with their service to the Company, not to exceed in the aggregate
2,100,000 shares (appropriately adjusted to reflect stock splits, stock
dividends, combinations of shares and the like with respect to the Common Stock)
less the number of shares (as so adjusted) issued pursuant to subscriptions,
warrants, options, convertible securities, or other rights outstanding on
September 11, 1997, and listed in Schedule III of the Purchase Agreement
pursuant to clause (C) above (the shares exempted by this clause G being
hereinafter referred to as the "Reserved Employee Shares") provided that the
number of Reserved Employee Shares may be increased prior to December 31, 1998,
with the approval of a majority of the Board of Directors including the Class B
Director, the Class C Director, the Class D Director (as such terms are defined
in the Purchase Agreement) and Gary C. Butler as the director appointed by ADP
on behalf of the holders of the Class D Convertible Preferred Stock of the
Company (the "Other Class D Director") and at any time after December 31, 1998,
with the approval of either (i) a majority of the Board of Directors including
the Class B Director, the Class C Director, the Class D Director and the Other
Class D Director or (ii) all directors other than the Class B Director, the
Class C Director, the Class D Director or the Other Class D Director. If the
relevant acquisition specified in clause (D) of the previous sentence is
dilutive per the terms of clause D the closing of the transaction, the
applicable adjustment to the Warrant Shares pursuant to this Section 2(a) shall
be calculated using only that number of Additional Shares of Common Stock that
yield the dilution (but in no event, a number of Additional Shares of Common
Stock greater than was actually issued to effect the acquisition).
Notwithstanding anything in this Section 2 or otherwise to the contrary, (i)
after the closing of the initial firm commitment underwritten public offering of
securities (including all issuances of securities related thereto) of the
Company (the "IPO") no adjustment or adjustments shall be made pursuant to this
Section 2(a) that would result in an aggregate increase after such date in the
number of Warrant Shares that is greater than the increase from the adjustment
that would result from the sale and issuance of a number of Additional Shares of
Common Stock that is equal to a 10% increase in the Base Amount in effect
immediately after the closing of the IPO and (ii) no adjustment or adjustments
shall be made pursuant to this Section 2(a) with respect to any acquisition
(whether by merger or consolidation or otherwise) where the holders of capital
stock of the Company immediately prior to such acquisition hold immediately
after such acquisition less than 51% by voting power of the capital stock of the
surviving corporation.

             (b)    For purposes of Section 2(a), (i) "Base Amount" shall mean
the sum of 15,211,094 plus a number equal to the number of Additional Shares of
Common Stock previously

                                      -5-

<PAGE>   6

sold and issued by the Company that previously required an adjustment in the
number of Warrant Shares pursuant to this Section 2(b), (ii) Additional Shares
of Common Stock shall mean shares of Common Stock sold and issued (or, pursuant
to subsection 2(c) below, deemed to be sold and issued by the Company) and (iii)
"Convertible Securities" shall mean any equity shares or other equity securities
of the Company directly or indirectly convertible into or exchangeable for
Common Stock.

             (c)    If during the period and for the purpose specified in the
introductory clause of Section 2(a) above the Company shall sell and issue
Convertible Securities, then the maximum number of shares of Common Stock (as
set forth in the instrument relating thereto without regard to any provision
contained therein for a subsequent adjustment of such number) issuable upon the
conversion or exchange of such Convertible Securities shall be deemed to be
Additional Shares of Common Stock issued as of the time of such issue, provided
no further adjustment pursuant to Section 2(a) shall be made upon the subsequent
issue of Convertible Securities or shares of Common Stock upon the conversion or
exchange of such Convertible Securities.

             (d)    If outstanding shares of the Company's Common Stock shall
be subdivided into a greater number of shares or a dividend in Common Stock
shall be paid in respect of Common Stock, the Purchase Price in effect
immediately prior to such subdivision or at the record date of such dividend
shall simultaneously with the effectiveness of such subdivision or immediately
after the record date of such dividend be proportionately reduced. If
outstanding shares of Common Stock shall be combined into a smaller number of
shares, the Purchase Price in effect immediately prior to such combination
shall, simultaneously with the effectiveness of such combination, be
proportionately increased. When any adjustment is required to be made in the
Purchase Price, the number of Warrant Shares purchasable upon the exercise of
this Warrant shall be changed to the number determined by dividing (i) an amount
equal to the number of shares issuable upon the exercise of this Warrant
immediately prior to such adjustment, multiplied by the Purchase Price in effect
immediately prior to such adjustment, by (ii) the Purchase Price in effect
immediately after such adjustment.

             (e)    If there shall occur any capital reorganization or
reclassification of the Company's Common Stock (other than a change in par value
or a subdivision or combination as provided for in subsection 2(d) above), or
any consolidation or merger of the Company with or into another corporation, or
a transfer of all or substantially all of the assets of the Company, then, as
part of any such reorganization, reclassification, consolidation, merger or
sale, as the case may be, lawful provision shall be made so that the Registered
Holder of this Warrant shall have the right thereafter to receive upon the
exercise hereof the kind and amount of shares of stock or other securities or
property which such Registered Holder would have been entitled to receive if,
immediately prior to any such reorganization, reclassification, consolidation,
merger or sale, as the case may be, such Registered Holder had held the number
of shares of Common Stock which were then purchasable upon the exercise of


                                      -6-
<PAGE>   7

this Warrant. In any such case, appropriate adjustment (as reasonably determined
in good faith by the Board of Directors of the Company) shall be made in the
application of the provisions set forth herein with respect to the rights and
interests thereafter of the Registered Holder of this Warrant, such that the
provisions set forth in this Section 2 (including provisions with respect to
adjustment of the Purchase Price) shall thereafter be applicable, as nearly as
is reasonably practicable, in relation to any shares of stock or other
securities or property thereafter deliverable upon the exercise of this Warrant.

             (f)    When any adjustment is required to be made pursuant to
this Section 2, the Company shall promptly mail to the Registered Holder a
certificate setting forth the Purchase Price and/or the number of Warrant Shares
after such adjustment and setting forth a brief statement of the facts requiring
such adjustment. Such certificate shall also set forth the kind and amount of
stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in
subsection 2(d) or (e) above.

       3.    Fractional Shares. The Company shall not be required upon the
exercise of this Warrant to issue any fractional shares, but shall make an
adjustment therefor in cash on the basis of the Fair Market Value per share of
Common Stock, as determined pursuant to subsection 1(c) above.

       4.    Requirements for Transfer.

             (a)    This Warrant and the Warrant Shares shall not be sold or
transferred to a transferee receiving the right to acquire less than 380,000
Warrant Shares (subject to adjustment) and unless either (i) they first shall
have been registered under the Securities Act of 1933, as amended (the "Act"),
or (ii) the Company first shall have been furnished with an opinion of legal
counsel, reasonably satisfactory to the Company, to the effect that such sale or
transfer is exempt from the registration requirements of the Act.

             (b)    Notwithstanding the foregoing, no registration or opinion
of counsel shall be required for (i) a transfer by a Registered Holder which is
a partnership to a partner of such partnership or a retired partner of such
partnership who retires after the date hereof, or to the estate of any such
partner or retired partner, if the transferee agrees in writing to be subject to
the terms of this Section 4, or (ii) a transfer made in accordance with Rule 144
under the Act.

             (c)    Each certificate representing Warrant Shares shall bear a
legend substantially in the following form:

             "The securities represented by this certificate have not been
             registered under the Securities Act of 1933, as amended, and may


                                      -7-
<PAGE>   8
             not be offered, sold or otherwise transferred, pledged or
             hypothecated unless and until such securities are registered under
             such Act or an opinion of counsel satisfactory to the Company is
             obtained to the effect that such registration is not required."

The foregoing legend shall be removed from the certificates representing any
Warrant Shares, at the request of the holder thereof, at such time as they
become eligible for resale pursuant to Rule 144(k) under the Act.

       5.    No Impairment. The Company will not, by amendment of its charter or
through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist
in the carrying out of all such terms and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.

       6.    Notices of Record Date, etc. In case:

             (a)    the Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time deliverable upon the
exercise of this Warrant) for the purpose of entitling or enabling them to
receive any dividend or other distribution, or to receive any right to subscribe
for or purchase any shares of stock of any class or any other securities, or to
receive any other right; or

             (b)    of any capital reorganization of the Company, any
reclassification of the capital stock of the Company, any consolidation or
merger of the Company with or into another corporation (other than a
consolidation or merger in which the Company is the surviving entity), or any
transfer of all or substantially all of the assets of the Company; or

             (c)    of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company,

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder of this Warrant a notice specifying, as the case may be, (i)
the date on which a record is to be taken for the purpose of such dividend,
distribution or right, and stating the amount and character of such dividend,
distribution or right, or (ii) the effective date on which such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation or
winding-up is to take place, and the time, if any is to be fixed, as of which
the holders of record of Common Stock (or such other stock or securities at the
time deliverable upon the exercise of this Warrant) shall be entitled to
exchange their shares of Common Stock (or such other stock or securities) for
securities or other property deliverable upon such

                                      -8-
<PAGE>   9

reorganization, reclassification, consolidation, merger, transfer, dissolution,
liquidation or winding-up. Such notice shall be mailed at least ten (10) days
prior to the record date or effective date for the event specified in such
notice.

       7.    Reservation of Stock. The Company will at all times reserve and
keep available, solely for issuance and delivery upon the exercise of this
Warrant, such number of Warrant Shares and other stock, securities and property,
as from time to time shall be issuable upon the exercise of this Warrant.

       8.    Exchange of Warrants. Upon the surrender by the Registered Holder
of any Warrant or Warrants, properly endorsed, to the Company at the principal
office of the Company, the Company will, subject to the provisions of Section 4
hereof, issue and deliver to or upon the order of such Holder, at the Company's
expense, a new Warrant or Warrants of like tenor, in the name of such Registered
Holder or as such Registered Holder (upon payment by such Registered Holder of
any applicable transfer taxes) may direct, calling in the aggregate on the face
or faces thereof for the number of shares of Common Stock called for on the face
or faces of the Warrant or Warrants so surrendered.

       9.    Replacement of Warrants. Upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and (in the case of loss, theft or destruction) upon delivery of an
indemnity agreement (with surety if reasonably required) in an amount reasonably
satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.

       10.   Transfers, etc.

             (a)    The Company will maintain a register containing the names
and addresses of the Registered Holders of this Warrant. Any Registered Holder
may change its or his address as shown on the warrant register by written notice
to the Company requesting such change.

             (b)    Subject to the provisions of Section 4 hereof, this
Warrant and all rights hereunder are transferable, in whole or in part, upon
surrender of this Warrant with a properly executed assignment (in the form of
Exhibit II hereto) at the principal office of the Company.

             (c)    Until any transfer of this Warrant is made in the warrant
register, the Company may treat the Registered Holder of this Warrant as the
absolute owner hereof for all purposes; provided, however, that if and when this
Warrant is properly assigned in blank, the Company may (but shall not be
obligated to) treat the bearer hereof as the absolute owner hereof for all
purposes, notwithstanding any notice to the contrary.

                                      -9-
<PAGE>   10

       11.   Mailing of Notices, etc. All notices and other communications from
the Company to the Registered Holder of this Warrant shall be mailed by
first-class certified or registered mail, postage prepaid, to the address
furnished to the Company in writing by the last Registered Holder of this
Warrant who shall have furnished an address to the Company in writing. All
notices and other communications from the Registered Holder of this Warrant or
in connection herewith to the Company shall be mailed by first-class certified
or registered mail, postage prepaid, to the Company at its principal office set
forth below. If the Company should at any time change the location of its
principal office to a place other than as set forth below, it shall give prompt
written notice to the Registered Holder of this Warrant and thereafter all
references in this Warrant to the location of its principal office at the
particular time shall be as so specified in such notice.

       12.   No Rights as Stockholder. Until the exercise of this Warrant, the
Registered Holder of this Warrant shall not have or exercise any rights by
virtue hereof as a stockholder of the Company.

       13.   Change or Waiver. Any term of this Warrant may be changed or waived
only by an instrument in writing signed by the party against which enforcement
of the change or waiver is sought.

       14.   Headings. The headings in this Warrant are for purposes of
reference only and shall not limit or otherwise affect the meaning of any
provision of this Warrant.

       15.   Governing Law. This Warrant will be governed by and construed in
accordance with the laws of the State of Delaware.

                                        CAREERBUILDER, INC.


                                        By: /s/ JAMES THOLEN
                                           --------------------------------

[CORPORATE SEAL]                        Title: CFO
                                              -----------------------------

ATTEST:
/s/ RICHARD WATHEN
-------------------------



                                      -10-




<PAGE>   11

                                                                       EXHIBIT I

                                  PURCHASE FORM

To:                                                        Dated:
   -----------------                                             --------------

       The undersigned, pursuant to the provisions set forth in the attached
Warrant (No. ADP1), hereby irrevocably elects to purchase _____ shares of the
Common Stock covered by such Warrant. The undersigned herewith makes payment of
$____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant. Such payment takes the form of (check
applicable box or boxes):


         [    ]     $_________ in lawful money of the United States, and/or


         [    ]     the cancellation of such portion of the attached
                    Warrant as is exercisable for a total of ______
                    Warrant Shares (using a Fair Market Value of $_______
                    per share for purposes of this calculation).

                           Signature:
                                     --------------------------

         Address:
                 ----------------------------

                 ----------------------------



                                     -1-
<PAGE>   12


                                                                      EXHIBIT II

                                 ASSIGNMENT FORM

         FOR VALUE RECEIVED, ________________________________________
hereby sells, assigns and transfers all of the rights of the undersigned under
the attached Warrant (No. ADP1) with respect to the number of shares of Common
Stock covered thereby set forth below, unto:


Name of Assignee                    Address                   No. of Shares




Dated:                     Signature:
      --------------                 -------------------------------

Dated:                     Witness:
      --------------               ---------------------------------



                                      -1-
<PAGE>   13
                                                                    Exhibit 10.8

                              CAREERBUILDER, INC.
                            11495 SUNSET HILLS ROAD
                                RESTON, VA 20190

                                                                  March 15, 2000

ADP, Inc.
One ADP Boulevard
Roseland, NJ 07068

Attention: General Counsel

Dear Sir:

     Reference is made to the Amended and Restated Common Stock Purchase Warrant
(Warrant No. ADP1), originally issued on January 23, 1998 and amended and
restated on March 5, 1999 (the "Warrant") by CareerBuilder, Inc, a Delaware
corporation formerly known as NetStart, Inc. (the "Company"), to ADP, Inc., a
Delaware corporation ("ADP"). The Company desires to amend the Warrant as set
forth below and hereby requests your agreement to such amendment.

     AMENDMENT OF WARRANT. The Warrant is hereby amended as follows:

     1.   SECTION 1(a). Section 1(a) of the Warrant is hereby amended by
deleting in its entirety the Tranche II row of the chart appearing therein
which reads as follows:

<TABLE>
<S>          <C>                 <C>                       <C>                    <C>
Tranche II    180,000-380,000     $10,200,000               3/1/99-3/30/01         3/30/01
</TABLE>

and replacing it with the following new row:

<TABLE>
<S>          <C>                 <C>                       <C>                    <C>
Tranche II    180,000-380,000     $10,200,000-20,400,000    4/01/2000-3/31/2001    3/31/2001
</TABLE>

     2.   SECTION 1(a). Section 1(a) of the Warrant is further amended by
deleting the dates "4/1/01-3/30/02" and "3/30/02" appearing in the Tranche III
row of the chart appearing therein and replacing them with the dates
"4/1/2001-3/31/2002" and "3/31/2002" respectively.

     3.   This Amendment is limited as specified and shall not constitute a
modification, acceptance or waiver of any other provision of the Warrant, and
all other provisions off the Warrant remain in full force and effect. This
Amendment may be executed in any number of counterparts and by the different
parties hereto on separate counterparts, each of which counterparts when
executed and delivered (including by way of facsimile) shall be an original, but
all of which shall together be one and the same instrument. This Amendment and
the rights and obligations of the parties hereunder shall be construed in
accordance with and governed by the laws of the State of Delaware.
<PAGE>   14
ADP, Inc.
One ADP Boulevard
Roseland, NJ 07068
Page 2 of 2

     If you are in agreement with the foregoing, please execute a counterpart
of this letter and return the signed counterpart to us as soon as possible.

                                        Very truly yours,

                                        CAREERBUILDER, INC.

                                        By: /s/ James A. Ruben
                                           ----------------------------
                                           Name:  James A. Ruben
                                           Title: CFO

Accepted and Agreed:

ADP, INC.

By: /s/ James B. Benson
   ---------------------------
   Name:  James B. Benson
   Title: President