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Full user review
"Good security addition."
Again, free. You cannot have enough security. This works great. The scans are a bit slow, but with efficiency, you trade off speed. I used to use Ad-Aware and spybot, but they were too buggy.
None that I can think of.
Again, it's good security software that does what it should, and it's free. I've never tried the pro version, but I'm sure it's every bit as good.