Screencapping with Windows Media Player

I have looekd up several tutorials on screencapping in WMP, but something still doesn't work.

I've moved my Acceleration ( Tools >> Options >> Video Acceleration ) down to 0, restarted the program, and tried BOTH normal "Printsceen" and "Alt + Printscreen", but when I past the screenshot into Paint/Adobe Photoshop, my image still saves as black (and before I save it the screenshot of the video wont move with the rest of the picture).

Does anyone have any ideas?

PS. I got the screencaps to originally work with things saved onto my hard drive, but now it wont work for things on a DVD.

~hobbit_hunter