Just an FYI, but I noticed a few people saying, "I have Norton and AVG..." on thier machine. There is a known conflict between these two that makes them essentially negate eachothers efforts. Dont run both at the same time. Others, like Kaperski (sp?), the one mentioned in the stickies, do not conflict with AVG. Also, Process Guard is your friend! Process Guard will let you choose what can and can not run, or even if you'll let it run sometimes and not others.
I use the following...
AVG anti-virus free edition
AVG Anti-Spy Ware Free Edition
SpyBot Search and Destroy
AD-Aware Personal free edition
and I occasionally install the trial Kaperski.
I update and scan weekly and anytime i notice a new virus/malware thing flying around the net. In fact, b/c i wouldnt let Real player boot each time I turned ffxi on (thank you process guard and personal loathing of real player) I even avoided the recent attack on FFXI info via real player. Since then, Real has been uninstalled, never to return :D
I will say this, I am ALWAYS taking jobs from my co-workers to clean viruses. They come to me with a Paid in full Norton and ask, "How can I have a trogen?" I take the drive home, drop it in my "work" machine and scan with AVG...LOL 5-10 Trogans almost every time! Norton and McCaffy both are worthless and give a very false sense of security ;; On the otherhand, if you work with me...please keep running Norton cuz those clean up are easy money :D (JK)