I used norton since 2000, but the new version required more and more resources and it was impossible to me and the support team of symantec make the 2004 version work at my XP pro system, so I switched to AVG free, the best I could find, and the antivirus the less resources takes.
Which antivirus utility protects your computer?
AVG Anti-Virus (love or hate it?)
Kaspersky Anti-Virus (love or hate it?)
McAfee VirusScan (love or hate it?)
Norton AntiVirus (love or hate it?)
Panda Titanium Antivirus (love or hate it?)
Trend Micro PC-cillin (love or hate it?)
Other (what is it?)
I don't need no stinkin' antivirus app. (really, why not?)

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic