If you want to how to run if avast antivirus will not open, you can follow the step given below:
Solution 1: Run a Smart Scan Using Avast
Solution 2: Update Avast to the Latest Version
Solution 3: Avast Clean Install
Solution 4: Uninstall XNA on Your Computer
Solution 5: Starting Service
Hopefully above steps will help you to fix the issue if not you can also follow our blog to see more on avast free antivirus won't open.