If you have Windows 10 and the menu don't appear then you don't worry and follow these solutions:
Procedure 1
Open a Shell Window (as administrator) and run the following command:
sfc /scannow
the scan may take some time and will end with one of three results:
- Windows did not find any integrity violations
- Windows Resource Protection found corrupt files and repaired them mean there are now no corrupt files
- Windows Resource Protection found corrupt files but was unable to fix some (or all) of them indicates a problem.
if you are in the third case then open a Powershell and run the following command:
DISM /Online /Cleanup-Image /RestoreHealth
Procedure 2
Open Powershell and run the following command:
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Wait until the app download and installation process completes
Ignore any red text that appears and restart Windows.
Procedure 3
Create a new user account with the following command:
net user NewUsername NewPassword /add
i.e.
net user next72user next72ablaca /add
Log into the new account
Restart Windows and log into the new user account.
The Start menu should now work, so you can change the new local account to a Microsoft account, and transfer your files and settings.
NOTE
I have try all steps and the menu did not appear.
I noticed that antivurs icon (AVIRA) did not appear. I re-enabled the service to restore the launcher dell'antivurs service and now magically the windows menu works. Maybe just a coincidence?