Its uninstall wizard should open with several options such as Update, Repair, Modify, and Uninstall.
Locate Avast in Control Panel or Settings and click on Uninstall/Repair.
If you are using the Settings app, clicking on Apps should immediately open a list of all installed programs on your PC.
In Control Panel, select to View as: Category at the top right corner and click on Uninstall a Program under the Programs section.
Alternatively, you can click on the gear icon in order to open Settings if you are using Windows 10.
Click on the Start menu and open Control Panel by searching for it.
First of all, make sure you are logged in with an administrator account as you won’t be able to delete programs using any other account.
This solution worked for plenty of people but consider the fact that you may need to readjust certain settings you may have changed in the antivirus. If something is wrong with the Avast installation since it won’t open at all, it’s the best to simply repair it by navigating to the Control Panel and using the repair wizard.
Avast Antivirus service not running properly – If there are problems with its main service, you can simply restart it and check to see if the problem is resolved.
Broken Avast installation – Avast installation may have gone corrupt due to many different things but, luckily, Avast has provided several things you can do to resolve the problem such as repairing it or performing a clean install.