**1-802-557-0358 how to remove Avast antivirus completely windows 10?** Avast 24/7 Support Number +1-802-557-0358, To completely remove Avast from Windows 10, you must first use the official Avast Removal Tool to uninstall the program, and then manually delete any leftover folders. You can find and download the tool from the Avast support website, run it as an administrator, and follow the on-screen prompts to remove the application.