Can you give me link for some great and free antivirus

Can you tell me what do you recomend me. But that they are free or at least that I can downloadem from internet for free
Answer #1
Actually free:
AVG
Avira
-Free:
Kaspersky
Nod32
Answer #2
free Kaspersky Internet Security 2009
Actually free Avira AntiVir Personal + Comodo Firewall Free is an actually free and good alternative.
Answer #3
The Best One:Bit Defender.Even Blocks the Download site before download!
Answer #4
This one is . It is specifically for threats that arise from Pen drives. If you are interested,
http://www.google.com?t=1861926&highlight=