I don't rate AVG much and there are much better AV and even Free AV
I suggest AVG uninstall using AVG removal tool - http://kb.eset.com/esetkb/index?page=content&id=SOLN146
Reboot upon completion so that boot driver can be removed.
I would install MSE (Windows 7) - http://windows.microsoft.com/en-us/windows/security-essentials-download
If Windows 8.1/8 - turn on Windows Defender -
Re-enable Windows Defender in Windows 8 (aka MSE in Windows 7, Vista)
