Avast is free antivirus software that protects from many threats. It offers Uninstall Utility that you can use to completely remove Avast Antivirus from your pc. After removing, please don’t leave your PC without antivirus because, without antivirus, your device will be in danger. So, install any other antivirus.
The most common way to uninstall the Avast antivirus and its components is here:
Open the Avast antivirus on your computer by clicking the Menu button at the user interface.
From the drop-down menu, go to Settings.
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Article source: https://how-to-uninstall.co/how-to-uninstall-avast-antivirus-from-pc