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

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

Similar:
How to Install Avast as a Lightweight Antivirus
What to Do When Your Norton or McAfee Antivirus Expire
How to Tell the Difference Between a Virus and a False Positive
Which Anti-Malware App Is Best and Can It Run Alongside My Antivirus

  Download