Screencaps in Windows Media Player

Really sorry to bother you, but I have searched the memories high and low and the 'net as well, but I can't find anything at all to help me.

I've been trying to make screencaps with Windows Media Player. I have reduced the video acceleration to "none" and and unchecked overlays, but when I paste the image into PSP9 (after using the "print screen" button and cropping and all that) and try to save it, it always shows up as a blank screen when I open the "my pictures" folder. Any suggestions?

Thanks in advance.