Whenever you wanna take a screenshot of a good movie or whatever you press "the print screen" button and all you see is a black screen. Well, not anymore.

All you have to do is open you Windows Media Player (All Versions)
click on the right mouse button and goto Tools > Options... > In the tabs goto Performance
and down there you'll see "Video acceleration" move the button from full to NONE
Press Apply and you'r done!