Here, you can get your free copy of the AVG 7.0 Anti-Virus System - AVG 7.0 Free Edition and you will be able to use it without any limitations for life of the product.
Avast Home Edition
avast! 4 Home Edition is a free antivirus software for home noncommercial use. It scans for viruses, worms and Trojans on disk, CDs, in E-mail, IM and P2P . Incremental updates of virus database (twice a week) are small, fast and reliable.
AntiVir Personal Edition
The AntiVir Personal Edition offers the effective protection against computer viruses for the individual and private use on a single PC-workstation.
ClamWin is a Free Antivirus for Microsoft Windows NT/98/Me/2000/XP/2003. It provides a graphical user interface to the Clam AntiVirus scanning engine.
ScripTrap traps scripts when they attempt to run on your computer and provides the option of blocking them or letting them continue to run. You can also check the intercepted script with your anti-virus program before you decide to run it or not.
Trend Micro Online Scan
Give your PC a FREE check-up! HouseCall is a demonstration of the power of Web-based technologies that Trend Micro is developing to make deployment and management of virus protection in corporate settings fast and easy.
McAfee Stinger Virus Removal Tool
Stinger is a stand-alone utility used to detect and remove specific viruses. It is not a substitute for full anti-virus protection, but rather a tool to assist administrators and users when dealing with an infected system.
Symantec Virus Removal Tools
Symantec Security Response has developed tools to automatically conduct what would often amount to extensive and tedious manual removal tasks. Check this link for a list of virus removal tools.
BitDefender Virus Removal Tools
SOFTWIN provides you with a powerful set of Virus Cleaning Tools, designed to detect and remove viruses that infected your system. These applications are also valuable because of their size, making them easily downloadable even with a slow Internet connection. Check this link for a list of virus removal tools.