Document:

<PAGE>
                                                                   EXHIBIT 10.34

                                LEASE AMENDMENT

This document amends the Lease Agreement dated November 14, 1996 and amended
November 24, 1997 by and between Blue Lake Partners, Ltd. ("Landlord"), and
McAfee Software, Inc., a Delaware Corporation ("Tenant"), for the Premises
located at 4099 McEwen, Suites 500, 620, & 700, Dallas, Texas 75244 as follows:

Basic Lease Provision No. 2 "Premises"

Effective March 16, 1998, Tenant shall temporarily expand within the Building to
Suites #135 and #405 containing 4,137 rentable square feet and as further
defined and delineated on the attached Exhibit "A-3", increasing the total
leased Premises to 41,849 rentable square feet.

Basis Lease Provision No. 3 "Basic Rent"

Effective March 16, 1998, Tenant's Basic Monthly Rent shall adjust as follows:
<Table>
<Caption>
                 Term                         Monthly Rent
                 ----                         ------------

<S>                                           <C>
      March 16, 1998 thru May 31, 1998         $55,789.35
</Table>

Basic Lease Provision No. 7 "Term"

Effective March 16, 1998, Tenant's Lease Term for the temporary expansion space
(Suites #130 and #405) shall be for two (2) months for an expiration date on
the temporary expansion space only of May 31, 1998. Should long term expansion
space not be available June 1, 1998, Landlord agrees to Tenant holdover on a
month-to-month basis.

Basic Lease Provision No. 11 "Tenant's Broker"

Tenant represents and warrants that it has dealt with no Broker or Agent in
connection with the execution of this Lease Amendment and Tenant agrees to
indemnify and holds harmless Landlord against all liabilities and costs arising
from a breach of such warranty including without limitation attorney's fees in
connection therewith.

Exhibit "D"

Tenant accepts these temporary suites in there current "as is" condition and
agrees that the Landlord has no leasehold improvement obligations.

Submission of this instrument for examination or signature by Tenant is not
effective until execution by and delivery to both Landlord and Tenant.

All other terms and conditions shall remain the same and in full force and
effect.

EXECUTED the 17th day of March, 1998.

<PAGE>
                              LANDLORD: Blue Lake Partners, Ltd.

                              By:  SF Realty, Inc. Its General Partner

                              By:  /s/ MARK HARRISON
                                   ----------------------------------
                                   Mark Harrison, Leasing Manager

                              TENANT:   McAfee Software, Inc.
                                        (a Delaware Corporation)

                              By:  /s/ SYDNEY McINTOSH
                                   ----------------------------------
                                   Sydney McIntosh
                                   VP, Sales Finance

<PAGE>
                                 Exhibit "A-3"

                                   [GRAPHIC]

<PAGE>
                                 Exhibit "A-3"

                                   [GRAPHIC]<PAGE>
                                                                   EXHIBIT 10.35

                                LEASE AGREEMENT

This document amends the Lease Agreement dated November 14, 1996 and amended
November 24, 1997 by and between Blue Lake Partners, Ltd. ("Landlord"), and
McAfee Software, Inc., a Delaware Corporation ("Tenant"), for the Premises
located at 4099 McEwen, Suites 500, 620, & 700, Dallas, Texas 75244 as follows:

Basic Lease Provision No. 2 "Premises"

Effective June 1, 1998, Tenant shall expand into Suite #300 in the 4101 McEwen
Building containing 15,869 rentable square feet within The Centre office
complex while maintaining all its space at 4099 McEwen Suites 500, 620, & 700.
The new, combined square footage will total 53,581 rentable square feet. The
expansion space (4101 McEwen, Suite #300) is further defined and delineated on
the attached Exhibit "A-2". Tenant shall have the right to tie both buildings
together with copper and fiber.

Basic Lease Provision No. 3 "Basic Rent"

Effective June 1, 1998, Tenant's Basic Monthly Rent shall adjust as follows:

<Table>
<Caption>
                 Term                             Monthly Rent
                 ----                             ------------

<S>                                               <C>
       June 1, 1998 thru Jan. 31, 2002             $73,387.35
       Feb. 1, 2002 thru Feb. 17, 2003             $78,014.50

</Table>

Basic Lease Provision No. 4 "Tenant's Pro Rate Share"

Effective June 1, 1998, Tenant's proportionate share of the 4101 McEwen
Building shall be set at 12.76% for all purposes under this Lease. Tenant's
proportionate share of the 4099 McEwen Building shall remain 30.47% for all
purposes under the Lease.

Basic Lease Provision No.'s 5&6 "Operating Expense Stop"

Effective June 1, 1998, the Expense Stop for the expansion space only (4101
McEwen, Suite #300) shall be set at an amount equal to the sum of the actual
grossed up operating expenses for 1998, expressed as a function of 124,326
rentable square feet for the building.

Basic Lease Provision No. 7 "Term"

Effective June 1, 1998, Tenant's Lease Term for the expansion space (4101
McEwen, Suite 300) shall be fifty-six (56) months for an expiration date
coterminous with Tenant's existing space of February 17, 2003.

Basic Lease Provision No. 11 "Tenant's Broker"

Tenant represents and warrants that it has dealt with no Broker or Agent in
connection with the execution of this Lease Amendment and Tenant agrees to
indemnify and hold harmless Landlord against all liabilities and costs arising
from a breach of such warranty including without limitation attorney's fees in
connection therewith.
<PAGE>
Exhibit "D"

Exhibit D, Work Letter, Plans Agreed Upon/Finish Allowance, paragraph 2.1,
shall be amended such that Landlord shall provide an allowance up to
$130,919.25 (The "Finish Allowance"). Tenant acknowledges that Landlord has
satisfactorily completed all of Landlord's work and all tenant improvements
called for by or under all prior Exhibit "D" construction plans and
specifications to the Lease and any Amendments, and the only work to be
performed by Landlord is under this Amendment. Tenant Improvements shall be
constructed in accordance with Exhibit D. Tenant agrees to execute an
Acceptance of Premises Memorandum upon Substantial Completion as defined in
Exhibit D.

Rider No. 3 "Tenant's Right of First Refusal"

Effective June 1, 1998, Tenant shall be granted a "Right of Second Refusal", in
the expansion space only (4101 McEwen, Suite 300), on all the area described on
the attached Schedule "A-1". Such Right shall be granted under the same terms
and conditions as Tenant's existing Right of First Refusal except that Tenant's
right of opportunity on the Second Right of Refusal space will be subordinate to
any and all existing renewal, expansion, and refusal rights of existing tenants.

Submission of this instrument for examination or signature by Tenant is not
effective until execution by and delivery to both Landlord and Tenant.

All other terms and conditions shall remain the same and in full force and
effect.

EXECUTED the 27th day of March, 1998.

                                    LANDLORD: Blue Lake Partners, Ltd.

                                    By:  SF Realty, Inc. Its General Partner

                                    By:  /s/ MARK HARRISON
                                         -----------------------------------
                                         Mark Harrison, Leasing Manager

                                    TENANT:   McAfee Software, Inc.
                                              (a Delaware Corporation)

                                    By:  /s/ SYDNEY McINTOSH
                                         -----------------------------------
                                         Sydney McIntosh
                                         VP Sales Finance

<PAGE>
                                 Exhibit "A-2"

                                   [Graphic]

<PAGE>
                                 Schedule "A-1"

                                   [Graphic]
<PAGE>
                                 Schedule "A-1"

                                   [Graphic]<PAGE>
                                                                   EXHIBIT 10.36

                                LEASE AMENDMENT

This document amends the Lease Agreement dated November 14, 1996 and amended
November 24, 1997 and March 27, 1998 by and between Blue Lake Partners, Ltd.
("Landlord"), and McAfee Software, Inc., a Delaware Corporation ("Tenant"), for
the Premises located at 4099 McEwen, Suites 500, 620, & 700, and 4101 McEwen,
Suite 300 Dallas, Texas 75244 as follows:

Basic Lease Provision No. 2 "Premises"

Effective June 1, 1998, Tenant shall expand within the same building into Suite
#405 in the 4099 McEwen Building containing 2,123 rentable square feet
maintaining all its space at 4099 McEwen Suites 500, 620, & 700 and 4101 McEwen
Suite 300. The new, combined square footage will total 55,704 rentable square
feet. The expansion space (4099 McEwen, Suite #405) is further defined and
delineated on the attached Exhibit "A-3".

Basic Lease Provision No. 3 "Basic Rent"

Effective June 1, 1998, Tenant's Basic Monthly Rent shall adjust as follows:

<TABLE>
<CAPTION>
                  Term                        Monthly Rent
                  ----                        ------------
<S>                                           <C>
     June 1, 1998 thru Jan. 31, 2002           $76,616.08
     Feb. 1, 2002 thru Feb. 17, 2003           $81,243.23
</TABLE>

Basic Lease Provision No. 4 "Tenant's Pro Rate Share"

Effective June 1, 1998, Tenant's proportionate share of the 4099 McEwen
Building shall be set at 32.18% for all purposes under this Lease.

Basic Lease Provision No.'s 5&6 "Operating Expense Stop"

Effective June 1, 1998, the Expense Stop for the expansion space only (4099
McEwen, Suite #405 - 2,123 rsf) shall be set at an amount equal to the sum of
the actual grossed up operating expenses for 1998, expressed as a function of
123,770 rentable square feet for the building.

Basic Lease Provision No. 7 "Term"

Effective June 1, 1998, Tenant's Lease Term for the expansion space (4099
McEwen, Suite 405 - 2,123 rsf) shall be fifty-six and one half (56 1/2) months
for an expiration date coterminous with Tenant's existing space of February 17,
2003.

Basic Lease Provision No. 11 "Tenant's Broker"

Tenant represents and warrants that it has dealt with no Broker or Agent in
connection with the execution of this Lease Amendment and Tenant agrees to
indemnify and hold harmless Landlord against all liabilities and costs arising
from a breach of such warranty including without limitation attorney's fees in
connection therewith.
<PAGE>
Exhibit "D"

Exhibit D, Work Letter, Plans Agreed Upon/Finish Allowance, paragraph 2.1,
shall be amended such that Landlord shall provide an allowance up to $17,514.75
(The "Finish Allowance"). Tenant acknowledges that Landlord has satisfactorily
completed all of Landlord's work and all tenant improvements called for by or
under all prior Exhibit "D" construction plans and specifications to the Lease
and any Amendments, and the only work to be performed by Landlord is under this
Amendment. Tenant Improvements shall be constructed in accordance with Exhibit
D. Tenant agrees to execute an Acceptance of Premises Memorandum upon
Substantial Completion as defined in Exhibit D.

Submission of this instrument for examination or signature by Tenant is not
effective until execution by and delivery to both Landlord and Tenant.

All other terms and conditions shall remain the same and in full force and
effect.

EXECUTED the 4th day of June, 1998.

                                    LANDLORD:  Blue Lake Partners, Ltd.

                                    By:  SF Realty, Inc. Its General Partner

                                    By:  /s/ MARK HARRISON
                                         -----------------------------------
                                         Mark Harrison, Leasing Manager

                                    TENANT:  McAfee Software, Inc.
                                             (a Delaware Corporation)

                                    By:  /s/ PRABHAT GOYAL, CFO
                                         -----------------------------------
                                         Prabhat Goyal, CFO

<PAGE>
                                 Exhibit "A-3"

                                   [GRAPHIC]

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