Microsoft Security Essentials (64-bit)
A newer version of Microsoft Security Essentials (64-bit) is available.
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Full user review
"Simply a great program"
Easy to install, never had any speed issues with my pc. I've been a big fan and user ever since it came out.
None, a very high quality free antivirus.!!
Five star rating, tried Comodo one month, was a nervous wreck.