Firstly I recommend you to install Bitdevender instead of Avast.
Follow these steps and check if it helps you.
2.) Type "msconfig" and hit "Enter".
3.) In the "System configuration" popup window, under services, check "Hide microsoft services".
4.) Now disable all services except Antivirus services.
5.) Click "OK"
Now run the Anti-Virus application and check if there any progress.
Thank you :)