|"If you're not on the Internet, don't need antivirus."|
Not true. If any files are shared with other machines (via floppy, CD/DVD, flash drives, network, etc), then you do need anti-virus. Even commercial programs have been known to contain viruses/malware. A machine would have to be completely "isolated from the outside world" to have "total protection"
"Channeling the spirit of jboy..."