Back in the days I was using norton antivirus...a looong time ago, and then I moved to Kaspersky, then NOD32...now I don't use any anti-virus, I switched to sandboxie + virtual machines + opendns filter, an updated host file from mvps and a router firewall.
When I get myself familiar with virtual machines I never looked back to my main computer cuz I have the best security bundle :envy me:.