Log off or turn off your computer in Windows Media Center
There are five ways to log off of or exit from your computer in Windows Media Center using the Shutdown menu.
You can use Media Only mode
to display Windows
Media Center full screen to watch recorded TV, play video games, or listen to music with others. In Media Only mode, the Minimize, Restore, and Close buttons are hidden in Windows
On the start screen, scroll to Tasks, and then click media only.
Click Yes to confirm.
To exit Media Only mode, on the start screen, scroll to Tasks, and then click exit media only.