|No, that is a standard registry key.|
Open task manager (press ctrl,alt and delete at the same time) then look for any items starting with "avg"> left click them one at the time> click "end process". Then try to install avg again.
If that does not work boot into safe mode and try to install it.
To get into safe mode:
Restart your computer
After hearing your computer beep once during startup, but before the Windows icon appears, tap the F8 key continually;
Instead of Windows loading as normal, a menu with options should appear;
Select the first option, to run Windows in Safe Mode, then press "Enter".
Choose your usual account.