ITunes Issue

[TeckEnthusiast]

I was cruising the iTunes store and clicked on the Stanford section of Itunes U. I wanted to watch a video so I clicked on it. Although I could hear the audio playing i couldnt see the video. The video is scrambled(see 2nd and 3rd photos in photo attachments). I have the latest versions of iTunes(8.2.1) and Quicktime(7.6.2). My system is up to date(see 1st photo in photo attachments). QE/CI are supported. QuartzGL is enabled. I have no problems watching the videos on youtube. I dont experience any problems when watching videos on apples website that require quicktime. I have a feeling this is a problem with the application itself. Not sure though.
ANY HELP WOULD BE APPRECIATED
THANX IN ADVANCE

[TeckEnthusiast]

UPDATE: I am sure that the problem is not my video card but itunes itself because I installed VLC Player and it works. I can watch videos without a problem. But when i try and watch any video using iTunes I get scrambled graphics although I CAN hear the audio. I deleted and installed it again but that didnt help. What could be the source of the problem.
ANY HELP WOULD BE APPRECIATED
THANX IN ADVANCE