Fix Critical Error: Start Menu isn’t working in Windows 10

There is an issue in Windows 10 which causes the following message to appear: "Start menu isn't working. We'll try to fix it the next time you sign in." Here a workaround which should resolve the issue if you face it.
When this error happens, Windows 10 shows the mentioned error message every time you click the Start button and can no longer open the Start menu.

There are two ways to fix the issue.

The first method is very simple. All you need to do is to start Windows 10 in Safe Mode.

To Fix Critical Error: Start Menu isn't working in Windows 10, start the operating system in Safe Mode as described below.

1. Boot into Troubleshooting options. The following screen will appear:
   
2. Click the Troubleshoot icon.
3. Next, click the Advanced options icon:
   
4. On the next screen, click the Startup options icon:
   
5. Click the Restart button and your PC will reboot:
   
6. After reboot, you will see the Startup settings screen:
   
   To enter Safe mode, press F4.
7. Reboot your PC immediately once you reach Safe mode and you are done.

This trick works for some users. For others, it does not work. For them, the Start menu still doesn't open in Windows 10. In that case, please refer to a second method which is written below.

If you still cannot open the Start menu after visiting Safe Mode, try to re-register the Start menu component in Windows 10. This can be done with PowerShell. Do it as follows.

1. Open a new elevated PowerShell instance.
2. Copy-paste or type the following command:

   Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

3. Restart Windows 10.

The command will repair all installed Universal apps in Windows 10. If one of them is causing the issue, it will be fixed. This should resolve the Start menu issue.

That's it.

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