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#21
It honestly should not matter. Just open it, it will prompt you to restart in safe mode. Do so.
If you installed avast! in a different folder than the default, browse for it. (Note: Be careful! The content of any folder you choose will be deleted!) If you cannot find the avast folder under c\program files that is fine, just do not select a folder then.
Click REMOVE
Restart your computer
Have you done tfc like I asked?