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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.
For more info: https://quickutilities.us/blog/how-to-fix-avast-not-opening

Repair Avast
If Avast installation is having problems, for example, it won’t open at all, the best way is to fix the Avast installation by finding the Control Panel and then following the repair wizard. This solution works for a lot of people but considering that you may need to readjust some settings, you may have changed them in your antivirus.

Step 1: First, make sure you log in with an administrator account because you won’t be able to use any other accounts to delete the program.
Step 2: Type control panel in the search bar and click Control Panel to open it.
Step 3: In Control Panel, select View by: Category and click Uninstall a program under the Programs section.
Step 4: In the Program and Features window, navigate to Avast, right-click it and then select Uninstall to uninstall Avast.
Step 5: The uninstall wizard of Avast should provide you with several options including Update, Repair, Modify, and Uninstall. Choose Repair and then click Next to fix the problem of Avast installation.
Step 6: A message will display on the screen that asks you to confirm the process.
Step 7: After completing the uninstallation process, click Finish. Then restart the computer to check if Avast now opens properly.

Greetings,
Peter