Problems playing DVD video w/ 6600GT

[kid_wonder24]

I have a PNY 6600GT and I haven't run into any problems until recently when I tried playing DVD's on it. I open powerdvd and start playing the video, and it plays but with like a black box over most of the video. Whenever I minimize or max the window I'll see the entire picture briefly, then it gets blacked out again. It's bumming me out cause I want to watch my new Seinfelds I got for Christmas but that DAMN box...

Also, could it be my new monitor perhaps? I got a Samsung Syncmaster 730B and I wondered if there could be some setting in the refresh rate or something of that sort? Any help would be appreciated

-Kid