AVG

 

      AVG Anti-Virus Free Edition is trusted antivirus and antispyware protection for Windows available to download for free. In addition, the new included LinkScanner® Active Surf-Shield checks web pages for threats at the only time that matters - when you're about to click that link.
AVG Anti-Virus Free has these following features:

Avira

 

What’s the secret to a faster PC? Antivirus, of course!
Secure and speed up your PC with Avira and Baidu PC Faster.
                    Avira Free Antivirus is not only one of the world’s most popular virus scanners, it’s also the easiest to use. With pushbutton convenience, this free program removes viruses, rootkits and other malware.

avast

avast! Free Antivirus represents the best free antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial & home use. Its features include: