Avast antivirus Home Edition represents the best FREE antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial & home use only. Both of these conditions should be met! If you are not a home user or if you use your computer for business
AVG Anti-VirusFree Edition 2011 will protect you from antivirus, spyware, rootkits and spam, It features a nicely designed, more user-friendly interface, and includes a desktop widget from which you can scan the system or update the virus database. Of course, you still have the same three types of scan:
AVG Anti-Virus Free Edition is trusted antivirus and antispyware protection for Windows available to download for free. Basic protection from viruses, spyware, and threats from the Internet.
Anti-virus and anti-spyware award winners
Real-time security in the exploration and the search
Avira AntiVir Personal - FREE Antivirus is a reliable free antivirus solution, that constantly and rapidly scans your computer for malicious programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts
ClamWin is a Free Antivirus program for Microsoft Windows 7 / Vista / XP / Me / 2000 / 98 and Windows Server 2008 and 2003. ClamWin Free Antivirus is used by more than 600,000 users worldwide on a daily basis. It comes with an easy installer and open source