IObit Security 360
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Full user review
"For freeware security, it actually works. Up to a limit"
It has quite a bit of options to check for spyware and such and to increase the performance of your computer.
Microsoft Security Sessions "might" be better as well a few others. But no real complaints just yet.
This is one of the best free downloads for delivering some kind of detection and prevention of malware and spyware and allows some customizing of the product to fit when you want to scan and a "smart" scan that goes over the most integral units of the computer, without the lengthy full scan, though I do recommend doing a full scan. Also, the tools section has some neat options to improve performance though you can't get into all of them without buying the full product. Still, I recommend it.