Avast is a popular antivirus software that comes pre-installed on many computers. If you want to delete Avast from your computer, there are a few different ways to go about it. The first way is to uninstall Avast from your computer. To do this, open the Start menu and search for “Uninstall a Program”. When the Uninstall a Program window opens, click on the Avast entry and then click on Uninstall. If you want to keep Avast installed but delete its files from your computer, you can use the Windows File Explorer. Open File Explorer and navigate to C:\Program Files (x86)\Avast Software\Avast\avastui.exe (where C:\Program Files (x86)\Avast Software\Avast\avastui.exe is located on 64-bit versions of Windows). Right-click on avastui.exe and select Delete. ..