Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Excellent
Full user review
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"Wonderful, light antivirus!"
Pros
Great protection, lightweight, automatically updates. Can't beat free! Can do a quick scan in <1 min. No adventisements/popups. 64 bit support. Comes directly from Microsoft and works well with their firewall. Small and easy install. Doesn't come with a lot of junk like tons of other AVs do.
Cons
Could have a few more features. First time full scan was a bit slow but that's expected. May be an issue for some but not for me but you must have a genuine copy of Windows 7 or Vista
Summary
I recently just switched over to this from avast! I highly recommend this antivirus. I've tried Bitdefender, avast!, ESET, Webroot, AVG, Panda, Norton, etc.... but this one really seems to work best for me. If this doesn't tickle your peach I would recommend looking at avast!