Avast Antivirus cannot be opened for various reasons, such as incorrectly installing an antivirus program to prevent the Avast Antivirus service from working. Here are some troubleshooting steps you can take to resolve Avast opening in Windows 10. However, it is best to restart your computer before using any of the following solutions. This feature updates your computer system and Temporarily removes any malicious data that may be causing problems with your computer. There is nothing worse than an antivirus program that you use to fix other system problems that show the error itself. The biggest bug reported by Avast is antivirus. Well, you don't have to worry because this problem can be solved quickly.