Saw a segment on the local TV morning news about various scams targeting Windows machines; at the end they mentioned a free malware scanning and repair app provided by Norton, the Norton Power Eraser. It does a very aggressive scan and automatically seeks out any root kits lurking on a machine. I downloaded and ran it and it seems to do what it claims; however, be advised to read carefully the caveats given by Norton: the scan is very aggressive and may result in some false positives. The scan I ran did return a few legit apps as suspect, but there is the ability to not have those specific apps removed or repaired. Here is a link to the Norton page:
https://security.symantec.com/nbrt/npe.aspx
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