Avast Clear (Avast Software Uninstall Utility) can completely remove Avast when the Add/Remove programs option does not work properly.

How to uninstall Avast using Avast Clear (Avast Software Uninstall Utility):

Download aswclear.exe on your desktop
Start Windows in Safe Mode (reboot, tap f8)
Open (execute) the uninstall utility
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!)
Click REMOVE
Restart your computer

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