Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Full user review
"Good, but there are lots of holes."
Doesn't slow your computer down, and it's free and simple.
Missed a lot of viruses and needed Malware Bytes to clear it up.
As much as I want to believe its constant updates are going to help protect me, it is false. There are still many security holes that viruses can sneak through.