What is the best free anti virus protection service?

http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html

No doubt it’s going to be Avast.It is easy to navigate, light-weighted, in addition to advanced website.Besides, you can install another anti-malware program which operates fine together with primary anti-virus software program – Malwarebytes Anti-Malware.Delight in:)

MSE in addition to Avast are generally two very good choices, although I know abhor the user interface inside Avast:P.