Microsoft Security Essentials
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Full user review
"Vast improvement over LiveOneCare."
Easy to use. Doesn't bog down my computer, or make its performance go all haywire like LiveOneCare did. Updates work relatively fast and without complications, which is very nice.
Doesn't catch some of the malware Agnitum Outpost Security Suite has, but one can't have just one program that does it all. Right?
All around good software, that does a decent job at scanning and protecting my computer.