Oh, is that so? - Star Trek: Website

I remember one time that windows didn't want to give an option to shutdown without rebooting for updates. That was the solution.
Or a not so forceful solution: Go into the Ctrl + Alt + Del menu, and press the power button while holding down Ctrl. Now you can do an emergency shutdown.
and with the mandatory “ssssh ssh ssh ssssshhhh” while holding down the power button.