Mikheil, Try this… Have a look @ this AVG article (http://avgclick.me/RevertPCTchanges).
AVG Guru
Either AVG or AVG TuneUP deleted Windows common shell dll and com surrogate dll files in my PC. These aren't viruses, they were/are stored in system32. It just thought that because that they have similar names as the viruses these were viruses or something, viruses do use these names for disguise and what not, but I guess the anti-virus deleted these files in my PC and now I can't access a lot of stuff and I'm getting a lot of errors.
Mikheil, Try this… Have a look @ this AVG article (http://avgclick.me/RevertPCTchanges).
AVG Guru