Microsoft Security Essentials
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Full user review
"Not for me"
Easy to install
Doesn't automatically get definitions updates regularly.
In my opinion, AV software should automatically check for definitions updates daily or immediately upon system startup. MSSE does not. After getting no updates for several days, I went to Microsoft Update and found a definitions update listed under "Software, Optional". Didn't seem right to me, so I switched back to AVG free.