If you are running Media Center in full screen mode, the Print Screen key’s output will only be a black screen. To enable print screen functionality while in the Full Screen Mode in Media Center, follow these steps.
1. Click the Orb (Start Button).
2. Go to the Search programs and files textbox and input regedit.
3. Select regedit.exe from the results.
4. When the UAC prompt appears, click the Yes button.
5. In the left pane of the Registry Editor, go to (and select):
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Service\Video\

6. Right-click in the right-pane.
7. Click New and select the appropriate DWORD for your system.
8. Name the new DWORD EnablePrintScreen.
9. Double-click the new DWORD.
10. In the Value data textbox, input 1.
11. Click the OK button.
12. Restart your computer for the change to take affect.
