Stop and disable Avast services.
(do not use old copies):
avastclear.exe /uninstall "Avast Premium Security" /silent /reboot /log="C:\avast_uninstall.log" The avastclear.exe tool works best when run from Safe Mode (especially for stubborn installations). You can boot into Safe Mode via command line: bcdedit /set current safeboot minimal Method 3: Forced Driver and Service Removal (Advanced) If both standard MSI and Avast Clear fail, you can manually remove Avast’s core components. This is a high-risk method—only use when Avast prevents all other removal attempts. uninstall avast command line
Open . Query the registry for Avast’s product code: Stop and disable Avast services