Hmm. Another nail in the coffin for AVG. (Could have happened with any AV, of course. Some folk actually don't run any.)
Interested in trying out any more free tools that might help fix this?
DrWebCureit
TM rootkit buster These are both fairly user friendly.
Anything DrWeb finds you should perhaps investigate further before quarantining (always quarantine; never delete outright.)
How to investigate? Google the file name.And/or ask here, or at a security forum. Full name and path should be quoted.