Know how to fix if avast does not open, you can follow the step given below:
1. Open the Run prompt.
2. Type services.msc and open it.
3. Go to Properties of avast antivirus.
4. Click on the Startup Type and select Automatic.
5. Click on Start and then Apply to save your changes.
Hopefully above steps will help you to fix the issue if not you can also follow our blog on avast will not load.