Making the Windows 10 Start Menu Work Again

There can be multiple reasons for the broken Start Menu and as usual, one solution cannot fit everywhere. Still, you should definitely give the following a try and who knows, the Start Menu starts working again, saving you from a full reset or reinstalling Windows 10 again.

Do backup any data you’ve saved in the Modern Apps  as all of them will be re-installed. Desktop software and apps won’t be affected though.
Open Windows PowerShell as Administrator
Right click Start button
Choose Command prompt (Admin)
Key in Powershell in the black window and hit Enter
Paste the following command in the Administrator: Windows PowerShell window and press Enter key:
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Wait for PowerShell to execute and complete the command. Ignore the few errors (in red color) that may pop up.