I have always wondered why cant I get that screenshot of that scene of the movie I am watching on Windows media player. It would always turn out to be a black screen and nothing else. Therefore, I decided to use the power of the internet to find a solution to this problem. As always, the internet had the answer to my problem.

Thanks to coathanger007 here’s the solution

Open Windows Media Player.
Click the Tools menu and then click Options.
Click the Performance tab. On the Performance tab, drag the slider bar to the None side in the Video acceleration frame.
Click Apply and then click OK.
Open the video file and play it. Pause where you want to take the screenshot. Now use the ALT+PrtScn keyboard combo. Open Microsoft Paint (or your favorite graphics program) and paste the screenshot in using the CTRL+V keyboard combination.
A quick way to open Microsoft Paint is to open the Run command, enter mspaint in the Open text box and click OK. Remember to set the acceleration back to high when you’re finished, because your video performance won’t be as good if you leave it at None.

Source: Taking a screenshot from windows media player