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I've been using Malwarebytes for my Mac for quite awhile.
I believe it also works for PCs. Download is free.
Check out their website and decide for yourself.

http://qikdownloads.com/usa1/malwarebytes/?t202id=713587&c1=malwarebytes&t202kw=malwarebytes&mkwid=WD2IeJCh&crid=31102986819&mp_kw=&mp_mt=e&pdv=c
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