Free antivrus software?

What antivirus software that is free and doesn't take up too much memory to use? Also which is the best in performance.

Free antivrus software?pc security

All three below are good and don't utilize too much RAM

AVG 7.5 AntiVirus (Vista Compatible)

http://free.grisoft.com/doc/1

Avast Home Antivirus (Vista Compatible)

http://www.avast.com/eng/avast_4_home.ht...

AntiVir PE (Vista Compatible)

http://www.free-av.com/

( Note: Only use one anti-virus product. Running more than one can cause conflicts thus rendering each ineffective.

http://service1.symantec.com/SUPPORT/nav... )

Free antivrus software?symantic

http://www.avast.com/

also works with vista
AVG use minimum memory resource.
avira anti-virus is great one

http://www.download.com/Avira-AntiVir-Pe...
Mc afeeeeeeee