AVG Anti-Virus Free Edition
Protect your computer from viruses and malicious programs.

ESET NOD32 Antivirus
Protect your system against viruses.

Kaspersky Anti-Virus
Monitor and detect viruses and protect your PC from viruses, malware, and Trojan attacks.

McAfee VirusScan Plus
Remove spyware or virus threats and prevent malicious applications from invading your PC.

Avira AntiVir Personal - Free Antivirus
Detect and remove more than viruses from your computer.