I use eset. It is not free though, but I have never had an infection with it installed. (then again with me surfing I have not had an infection since 2001 even without AV, only have to protect other people and you can't counter act stupid no matter what software you have)

I don't run AV on my daily cruiser, only on my system that I subject clients HDDs to.

I typically don't run av/as software either... My lappy has Avast, my GF's lappy is strapped to the hilt. Everything else runs naked. No infections.

A little sense goes a long way!