Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Full user review
"What's not to like?"
Free, easy install, nonintrusive, effective (so far)
Rather slow scan, but so what? You can still get on with your work.
In the past, found free software intrusive. When my McAfee protection expired I switched to MSSE because I thought the price of McF was outrageous. I don't even know that the MSSE is there - it just works.