Which is the bset free Antivirus ??????

i think there is nothing called best.u can download paid software from torrentz.and get some good quality professional antivirus.Macafee is best aslo NOD32

I think it is AVG Antivirus...

i Would suggest you to go to avg antivirus...it is totally free and protects well if you update the antivirus database once in a while...it would slow down your pc a bit...but it is good in freeware..... you can also download pirated version of norton corporate edition...dont go for norton 06,07 or 08...they would slow down your pc...but corporate edition is good one....

I would have to say Avast! Home Edition.. Its very reliable and I have been using it for more than 2 years now.. You can apply for a free serial number every time by entering a valid email address and it will be valid for 1 year...When expired, just re-apply....its that simple

I use Avira. It has been working very well and doesn't seem to slow down the computer at all. I've also heard good things about AVG.