system
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Well, at least we know you had malware on your C:/drive. We still don’t know what’s on the rest of your machine. 
Give Puran a try. After that, give that you found malware, I’d like you to check the information on the first post of this thread under Virus/Worms for you to check your machine for malware: http://forum.avast.com/index.php?topic=53253.0.
Follow the directions for obtaining the OTL logs (save them as ANSI and not Unicode). When the OTL scan completes, it will open two notepad windows. OTL.Txt and Extras.Txt. Post the two (2) OTL log as an attachment (Additional Options > Attach > Browse (the logs will be on your desktop > Post).
After you post and get back to me how the Puran defrag went, then I may need to refer you to our malware expert. Let me know if you have any questions. Thanks.