Do you mean you thought you got an mp3 that runs ON windows 7?
I'm pretty sure he means he downloaded an mp3 to his computer which runs Windows 7? What doesn't make sense about that? He's running Win7 on his computer, he downloaded an mp3.
Also I agree with ninja. Trying to remove the virus properly and fix all the damage it's done would be a pain. You might be better off just backing up everything you need (and scanning the backup with antivirus software to be safe) and reinstalling windows.
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