Whenever I hit printscreen, then copy and paste the image in photoshop, the picture doesn't show up - it's as if the new window I've opened in photoshop just shows whatever's behind the box (like it'll show whatever portion of the movie is present, behind the window, rather than showing what I tried to cap.)

I'm using WinDVD 4.0, Quicktime, Realplayer, and winmedia, all to no avail. Any suggestions?

thanks.