I use McAfee VirusScan 6.0, I don't like NAV2002.

here is a free and powerful antivirus software (DOS version) you can download. It is called F-Protection.

Web Site
http://www.frisk.is

Download (DOS)
http://www.f-prot.com/f-prot/download/getfpdosfree.html

Download (Linux)
http://www.f-prot.com/f-prot/download/getfplinfree.html