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MicroSoft Security Essentials. doesn't slow down your system doesn't miss viruses. I've used all of the major free virus scanners. MSE is much better. When I help someone, I replace all of the virus scanners with MSE. That includes the major brands. Thuroughly tested by Fred Langa of Windows Secrets. That's good enough for me.
http://windowssecrets.com/top-story/is-your-free-av-tool-a-resource-pig/