NOD, Avast, & AVG seem to be the most popular free choices among DP'ers anyway...then you get the occasional clown - NORTON The same people that think Norton is tops also still love AOL for their ISP
I use Nod32 and a few online servises. Nod32 is good because It monitors everything infected downloads, emails, attachemtns etc. New additions include Antispyware protection and Smart Security feature.
ESET is the company. Smart Security has the features of NOD32 + firewall and anti-spam. I use it as well.