free = avira, avast
pay = norton antivirus, kaspersky

For me is norton

Поздравляю всех посетителей данного красивого сайта с Новым Годом!
Пусть в наступающем году сбудутся все ваши давние мечты!

i think eset

Kaspersky Internet Security 2011

I use avast and I am pretty happy with it. It does a good job without slowing down my pc.

nod32 security

Nod32 All the way (:

been using Microsoft security essential since the first beta
before that I used Panda great AV but too much ressource used

ESET Nod32 is the best hands down, but it isn't free. Microsoft Security Essentials is very good for the computer novice who doesn't visit The Dark Side of the Moon...oops, I mean Internet!