AVG

Basic protection against viruses and spyware

• On Access Scanning
• Email Scanning
• Scheduled Updates
• Scheduled Scans

A one year subscription is only $34.99! Click Here for more info

All users of paid AVG products also qualify for generous discounts on subscription renewals and product upgrades.

BitDefender

FREE Antivirus for All

BitDefender Free Edition is your chance to use one of the world's most effective antivirus engines for free!

BitDefender Free Edition uses the same ICSA Labs certified scanning engines found in other BitDefender products, allowing you to enjoy basic virus protection for no cost at all.

BitDefender Free Edition is an on-demand virus scanner, which is best used in a system recovery or forensics role. If you are on an "always-on" Internet connection, we strongly advise you to consider using a more complex antivirus solution.

ClamWin

ClamWin is a Free Antivirus program for Microsoft Windows 98/Me/2000/XP/2003/Vista and Windows 7.

ClamWin Free Antivirus comes with an easy installer and open source code. You may download and use it absolutely free of charge. It features:

• High detection rates for viruses and spyware
• Scanning Scheduler
• Automatic downloads of regularly updated Virus Database.
• Standalone virus scanner and right-click menu integration to Microsoft Windows Explorer;
• Addin to Microsoft Outlook to remove virus-infected attachments automatically.

The latest version of Clamwin Free Antivirus is 0.97.3

Please note that ClamWin Free Antivirus does not include an on-access real-time scanner. You need to manually scan a file in order to detect a virus or spyware.

McAfee Avert Stinger

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. Stinger utilizes next generation scan engine technology, including process scanning, digitally signed DAT files, and scan performance optimizations.

Microsoft Security Essentials

Microsoft Security Essentials is available for Windows XP 32 bit & Windows 7 32 & 64 bit. It seems to do a good job protecting against viruses, spyware, and other evil software with real-time protection for your home or small business PCs.

Microsoft Security Essentials can be used by small businesses for up to 10 PCs.