AVG has the lowest detection of any free scanner. Try NOD32 and see if that comes up with something. Also, boot into safe mode and scan from there. It pretty much KILLS everything else when it comes to proactive scanning where AVG is usually last.
Might want to try AntiVir 7 http://www.free-av.com/antivirus/allinonen.html which has rootkit protection as well if NOD32 doesn't work for ya.
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