Antivirus Applications

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www.avira.com/en/avira-free-antivirus

Protects your computer against dangerous viruses, worms, Trojans and costly dialers
Excellent ★★★★

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www.avast.com/eng/download-avast-home.html

Excellent ★★★★

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free.avg.com/gb-en/download-avg-anti-virus-free-edition

At the bottom of the page.
i think AVG stands for Aint Very Good

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www.bitdefender.com/PRODUCT-14-en--BitDefender-Free-Edition.html

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.

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personalfirewall.comodo.com/download_firewall.html

Download our free Firewall and AntiVirus to take the first step in protecting
your PC from malware, viruses, worms, and more. *Install the AntiVirus
as a standalone *Install the Firewall as a standalone
*Install both Firewall and AntiVirus
The Mutz-Nutz ★★★★★

Code:

free.pctools.com/free-antivirus

PC Tools AntiVirus Free delivers basic protection against all the latest malware threats, and helps you browse more safely too. PC Tools AntiVirus Free 2011 is a lightweight antivirus tool that won't hog system resources or slow down your PC

Code:

www.freerav.com

Protects your computers against all types of viruses,
Trojans, worms, rootkits and other malicious programs. Ease of use and
Smartupdate technology make it an "install and forget" product and
entitles you to focus on your own jobs with your computer.

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www.threatfire.com

AntiVirus protects when others can't PCs are under constant attack from viruses, spyware and identity theft. Every day you hear about a new threat to your PC. They're coming faster than ever before, they're getting harder to stop and traditional antivirus products are not able to keep up.
Will your antivirus software catch the latest malware that just came out today? In most cases, no, because it simply does not know how to detect it yet. But ThreatFire's ActiveDefense technology does, and has proven to provide up to 243% more protection when combined with traditional AntiVirus products.
Excellent ★★★★
WARNING - if you uninstall this app make sure you do not manually remove the Tfkbmon file that is left behind as this is now your keyboard driver, threatfire has changed it to prevent keylogging

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www.microsoft.com/security_essentials

Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Excellent ★★★★