Looking for a freeware anti-virus software what will work with Windows Vista. Any suggestions?

I need something I can download tonight off the Internet if possible.

Looking for a freeware anti-virus software what will work with Windows Vista. Any suggestions?free spyware

avast! does.

http://www.avast.com/eng/avast-antivirus...

Enjoy !

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EDIT:

I see the AVG fanboys and cheerleaders are out in full force again here on Yahoo Answers!

In short, AVG Free is crap!

Mostly noobs, the naive, the computer illiterate, and children use AVG Free. These types love AVG because they say it is easy to use and almost never bothers them with any pop-ups or warnings. Of course AVG Free never bothers them, it hardly ever finds any virus to warn them about!

In test,

http://www.virus.gr/english/fullxml/defa...

after test,

http://www.av-comparatives.org/

after test,

http://antivirus.about.com/od/antiviruss...

after test ,

http://www.wilderssecurity.com/showpost....

after test,

http://www.pcworld.com/article/id,130869...

after test,

http://techsupportalert.com/issues/al_cu...

etc. etc. etc, ad nauseam, AVG free fares poorly.

AVG has proven itself to be a miserable performer at best. Missing almost 20%, while trying to detect known malware, in some tests. Not to mention almost non-existent heuristic detection and infrequent ''once-a day'' updates.