Sometimes it´s not possible to uninstall avast! the standard way - using the ADD/REMOVE PROGRAMS in control panel. In this case, you can use our uninstallation utility avast uninstaller.
Download avast uninstaller_latest.exe on your desktop
Start Windows in Safe Mode
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!)
Restart your computer