Start Menu does not open or not working in Windows 10

Before you proceed, some of you may want to create a system restore point first, so that you can revert back, if you find that the results are not what you expected.

1] Run the following command in an elevated command prompt, to run the System File Checker.

sfc /scannow

Restart after the scan is over and see if it helped.

2] Repair Windows Image. Open an elevated CMD copy-paste the following and hit Enter

Dism /Online /Cleanup-Image /RestoreHealth

Restart after the scan is over and see if it helped.

3] Make Start full screen and back. Enable Tablet Mode and Start Screen and then go back. See if this toggling has helped.

4] Open an elevated PowerShell window type the following and press Enter:

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

To open an elevated PowerShell prompt, type PowerShellp in taskbar Search, and in the result ‘Windows Powershell’ which appears, right-click and select Run as administrator.