There are two possible reasons Avast might not appear in Windows.
1. Avast Antivirus Services is not functioning properly
This could be the main reason Avast does not open in Windows.
2. Broken Avast Installation
You might have to restart Windows to fix the Avast installation.
If you are looking for effective solutions to the problem "Avast Free Antivirus Won't Open in Windows", then contact our professional Tech Support team.