More often then not, the best solution when dealing with an infected PC is to nuke it from orbit and rebuild it from scratch.

That's what I basically do to 99% of all infected computers. Saves me time and I know I'm delivering a 100% clean PC.

Then again, I probably have a few more resources that the rest of you would not normally have to make that process a little more on the easier side.
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T.K. Paker