If you have not been able to solve the problem shut down too long, maybe you can try this trick too.
Do I press Ctrl + Alt + Delete on your keyboard, then click on the tab "Shut Down" at the top of the Task Manager and select what you want:
- Stand By
- Turn Off
- Switch User
To Shut Down the computer select 'Turn Off' .. and in a few seconds you will be Shut Down Windows!
Please see the diagram below>