ItunesU videos not playing in Itunes but play ok if you download to laptop's drive and run them from windows directory

I'm having a problem playing some ItunesU videos, some play okay, some just show black screen and don't play, others show a still image but then doesn't play when trying to view them from itunes store. The audio files play with no issues.
I am using windows 7.
However, if I download the videos that don't play to the laptop's drive and run them from the windows directory they play okay. I don't want to have to download videos to see if they are something I'd like to watch.
Just for reference, an example of a video that plays okay is by UC Berkeley Math 16A 001, Fall 2011. Another is Introduction to Robotics by MIT.
An example that just shows blank screen is Stanford's Iphone & Ipad development, Fall 2011, both HD and SD versions.
While an example of a video that just shows the initial image but doesn't play is Harvard's Statistics 110. If you adjust the time of the video, the video moves to that part of the video but only shows the image at that time, ex. at 13:02, but doesn't play.
I've tried reinstalling quicktime first, then itunes. I've also tried putting directdraw in safe mode, but the problem videos still won't play.
Could it be some setting, since it plays when the file is downloaded but won't play straight from itunes store online (ie. pressing the play button beside the video in the itunes list).
Help pls.

You might have more luck asking on a general Windows troubleshooting site, but my guess would be an invalid or old audio or CD driver (or firmware in the drive). You might try checking those to make sure you have the correct and most current drivers.

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