Three Free Anti-virus software for windows

I use these  free anti-virus software, there are really good!

1.

http://www.avast.com/eng/home-registration.php

Welcome to the free registration of avast! Home Edition, the ultimate antivirus for home, non-commercial use. Both conditions should be met! For commercial environments, please use another product - avast! Professional Edition.

avast! 4 Home Edition works for 60 days after the installation in demo mode. You will obtain your FREE license key by E-mail after the registration. The license key is valid for 1 year. After one year you will need to just re-register.

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2.

http://safety.aol.com/isc/BasicSecurity/ 

McAfee^® VirusScan Plus – Special edition from AOL

Gives you the most comprehensive free set of safety tools available. We've partnered with a leading name in Internet security to deliver the essential protection you need:

• Virus protection guards your whole PC
• Spyware Protection blocks potentially unwanted programs
• Firewall helps keep hackers out

Since it's automatically on-guard and up-to-date, it helps protect you against today's attacks and tomorrow's threats, too.

Buy this protection yourself, and you could spend as much as $39.99, but with an aol.com email address, you can receive this comprehensive set of safety tools free.

3.

http://www.360safe.com/  Chinese web site

Get a free kaspersky from 360safe