Open the Charm bar by pressing Win+C, go to Settings, hold SHIFT and click Power>Restart. This will take you to the Option Menu, then select Troubleshoot>Advanced Options>run Command Prompt.
Open the Charm bar by pressing Win+C, go to Settings, hold SHIFT and click Power>Restart. This will take you to the Option Menu, then select Troubleshoot>Advanced Options>run Command Prompt.