In order to fix the “Start menu and Cortana” error you must do the following steps:
- Open Task manager
- Click on File > Run new task
- Write PowerShell
- Write this command on PowerShell prompt: “Get-AppXPackage-AllUsers|Foreach{Add-AppxPackage-DisableDevelopmentMode-register”$($_InstallLocation.)\AppXManifest.xml”}”
- Close the PowerShell window and restart the computer.