If the AVG cleaner and clean un/re-install of Avast does not work then run OTL and post log…one of the experts will look at it.
Go to this link and scroll down to the OTL instructions: http://forum.avast.com/index.php?topic=53253.0
I know this link is a “virus” removal link but it also has instructions/download/how-to for OTL.