Hi, Klauwaart
Welcome to the Microsoft Community.
In addition to the many things you've already tried, you can try the following suggestions to see if they can help you eliminate or troubleshoot the problem:
- Uninstall the update: If you have recently installed Windows Update and are experiencing problems, here is how to uninstall the update to try to resolve the issue:
- Select Settings > Windows Update > Update History > Uninstall Updates.
- In the list that appears, find the update you want to remove and select "Uninstall". Note: Some updates cannot be uninstalled.
- Restore the system: Use System restore to make restore points when you install a new app, driver, or Windows update, and when you create a restore point manually. Restoring won’t affect your personal files, but it will remove apps, drivers, and updates installed after the restore point was made.
- create a new local account: Create a new account to see if the problem of unresponsive start menu clicks still occurs.
If there is anything not clear, please do not hesitate to let me know.
Best Regards
Martin | Microsoft Community Support Specialist