Please suggest me names of some free anti-virus software which is very much effective.?

also give me names of the websites from which i can download them.PLEASEEEEEEEEEEEEEEE.

Please suggest me names of some free anti-virus software which is very much effective.?security

AVG Free from http://www.grisoft.com

Please suggest me names of some free anti-virus software which is very much effective.?trojan

nothing free will work right.
Nortun anti virus
RemoveitPro
Avast! anti-virus is good. Do a search on google or yahoo! for it.
I prefer - Avast freeware or aVG
i use avira as comparing my previous experience with norton and mcafee i prefer avira...

avira.com

grisoft.com
jibberja's answer is the best from my exprnce too.

others too have answered correctly from what they know.

thanks Jibberja.you have helped all in an important problem haunting deepinside all of us.....

param of sunflowerdance.com
I like AOL Active Virus Shield. Don't let the name AOL fool you. Active Virus Shield is made by Kaspersky which is one of top-rated anti-virus vendors in the world.

In recent tests, the most popular free anti-virus, AVG, was only able to detect about 82% of a very large sample of viruses. On the other hand, Active Virus Shield was able to detect better than 99% in the same test.