| I second cyrnel, slave and scan. If you’re truly paranoid, just backup and reinstall windows. When ever I work on a client system I have questions about, I yank the hard drive and slave it in mine for a full scan, if I find anything, I make an image of the drive, then remove the problems, if it boots after, great, if not, I boot the system and try to remove it under the real system, if that fails I reinstall and restore the files from the image. 
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