Because boot sector viruses spread by floppy disks and bootable CDs, every floppy disk and CD should be scanned for viruses. Shrink-wrapped software, demo disks from suppliers, and trial software are not exempt from this rule. Viruses have been found even on retail software. Scan all media that someone else has given you. Use caution when opening email attachments.
Email attachments are a major source of virus infections.
Microsoft Office attachments for Word, Excel, and Access can be infected by Macro viruses. Other attachments can contain file infector viruses. NAV Auto-Protect will scan these attachments for viruses as you open or detach them. If you have NAV 2000, we recommend that you enable Email protection, which will scan email attachments before the email message is sent to your email.