The correct procedure is to uninstall Avast from the Programs and Features window. This will launch the Avast uninstaller, which will continue the uninstallation. However, uninstalling antivirus is not as easy as uninstalling another application. The antivirus files are protected by digital signatures that only a “trusted installer” (in this case Avast) can work with. During the uninstallation process, you will need to provide signatures to complete the uninstallation.
Avast will install a fake operating system to complete the removal. The user will then be forced to reboot the computer in safe mode. Since Avast was the last operating system installed, it becomes the default operating system. When the computer reboots, the Avast operating system will load and Windows will open in safe mode. Avast will then perform a complete removal, leaving behind the uninstaller, registry keys and some files. Even if your antivirus has stopped working, you will need to complete the removal by removing any remaining files.
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