Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Full user review
"Excellent for a free product but not feature rich"
I think Security Essentials is a great starting point for recovering from a malware attack or virus. It is quick to run a scan and often returns useful results. It is more robust than <a href="http://www.squidoo.com/microsoft-security-essentials-free-antivirus">Windows Defender</a>
About 50% of the time I use Microsoft Security Essentials, it detects some, but not all of the malware. I always run Norton Antivirus after running Security Essentials, and about half the time, it finds malicious files that Security Essentials missed.
Excellent for the price (free!) and certainly software everyone should have downloaded and ready.