SuperAntiSpyware Free Edition
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Full user review
"Free version offers great comprehensive, unlimited use."
I used the Free edition for a year before buying the PRO edition. Main different was the Pro edition has real-time protection, and a few other things. It's a great, easy to use application that updates itself for the newest spyware/virus protection regularly.
Minor issue, I had an older netbook with 1gb RAM and this program used up alot of memory and CPU. Not too much but enough to cause some programs I used to lag. Otherwise I installed this onto my main PC and it runs in the background flawlessly.
You have nothing to lose when it's free, and the free version doesn't expire like other programs.