VideoLAN Screencapping?

I'm in the process of downloading a movie, and at the moment the only way I can view it, is through VideoLAN, because it hasn't finished downloading, and won't be finished for a few days. Although when I press Print Screen, and paste it into Paint Shop Pro, or any of the other graphics programs I have, I get a black screen.

Does anyone know how I can get the image I want to screencap to appear, and not just a black screen? Thanks :)