Which anti-virus should i download?

i need to download an antivirus and i want something that is free.. give me some options! :) thnx

Which anti-virus should i download?antispyware

McAfee

http://www.download.com/McAfee-VirusScan...

Which anti-virus should i download?best antivirus software

AVG
personally i use AVG 7.5 and it does me OK and it was free i also got AVG Anti-Spy ware for a free 14 day trail which was help full
macafee
avast is the best.
Avast! works great!