Alright, have you ever wanted to take a screenshot of a movie you uploaded to show the quality? Well so did I, and here's what I did, no downloads- 3 steps.
Open up Windows Media Player and click on the Tools tab, then Options:
Once there, click on the Performance tab.
Look at video acceleration part. Move that notch down 1 spot, hit apply , and ok:
Now you can take screenshots of movies/videos. If you still can't, move the video acceleration notch to None. If it is on none, you can't advance in the movie to take screenshots of the end, you would have to watch it to the end.