Delete previous AVG Version Folders In C:\Program Files\AVG
I know this is an old thread, but the issue is so frustrating and hopefully as simple as this solution to fix for you and worthy of at least attempting before you fall down the rabbit hole too far. I just stumbled across the solution to this issue buried in the thread below and after all the trouble everyone seems to go through to rid themselves of this problem, it can be resolved simply by deleting the folders of previous versions of AVG from C:\Program Files\AVG. Example: C:\Program Files\AVG\AVG10
Please save yourself some time and at least attempt to delete the previous versions folder first before you attempt any scans, IE resets, system restores, or any of the other suggestions out there at the moment.
Huge thank you to reecei in the following link for providing the simple fix!
I sincerely hope it works for anyone reading this as well.