Actually i don't even use anti-virus.
Only uses TuneUp once in a while to fix my registry.
And for 1 year and a half now, nv ganna virus. All you need to do
is be careful what you click and what website you visit.
If you are into torrents, read all comments posted on the torrent
carefully. Make sure none of the downloaders complain about the
reliability. And try to avoid downloading .exe unless its from big
cooperate websites.