Hi, have you encountered a problem when starting the Windows Security app window, crashing while opening it? Here is a quick fix:

1. Click the Windows Search Box and Type "Windows Security"

2. Right-click on the Windows Security icon and choose App settings

3. A window will pop up, scroll down to Terminate and click the "Terminate" button

4. Now click on the below "Repair" button

5. Finally click the "Reset" button to reinstall the Windows Security application

6. The issue should be resolved now. Reboot is not necessary.

If this does not resolve your issue and you're still experiencing the same problem, please don't hesitate to submit a ticket for the appropriate assistance.