ITunes 7 Video Playback Problems

I've been looking through this message board and haven't been able to find a post where this question was already asked, so I hope I'm not the only one experiencing this problem. With iTunes 7 (and the new Quicktime), all the mp4 videos on my computer will play only audio, while the video consists of either a blank window or a jumble of flashing bright colors laced with an occasional snippet of the video. All of these videos worked perfectly prior to the updates. Interestingly, there is one exception to this: all of the episodes of "It's Always Sunny In Philadelphia" (Season 2) play perfectly, for no apparent reason. I've tried uninstalling and reinstalling the applications, but that doesn't work, nor does merely trying to play them in Quicktime rather than through iTunes itself. Please let me know if there is ANY way to fix this, as I have invested a lot of time and money into my video collection! Thanks.
  Windows XP  

I would like to get some more information on this. Please try these steps:
1. Quit iTunes.
2. Go to: Start menu > Control Panels > QuickTime.
3. Click on the Advanced tab.
4. Un-check the checkbox next to "Enable Direct3D video acceleration".
5. Open iTunes.
6. Play the video.
Does the issue occur?
I also need to get some information from the affected systems:
1. Navigate to C:\Program Files\QuickTime.
2. Double-click on QTInfo.
3. Click on the yellow question mark icon in the upper left corner of the window and choose Save Log.
4. Save that file somewhere.
5. Attach that file to an email, and send it to me. Please also let me know the results of the steps above.

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