ITunes 7.1 in Vista - Extremely poor video playback

Has anyone had problems watching movies on the 7.1 version of iTunes with Vista. I am using Home Premium Edition on a Core2Duo with 2 GBs of RAM and a GeForce 7900 PCie. The system is about 3 weeks brand new.
This is the first install of iTunes on this machine. Movie playback appears to be okay in the first half our to 45 minutes, then it get so choppy, and then it stops all together.
Now Movies purchased from MovieLink play flawlessly. Windows Media Player has zero problems. Just iTunes.
Any tips to get this working before I just uninstall iTunes? It's getting worse and worse all the time.
Best,
Alex

It would be useful to look at the Direct X Diagnostics results from affected systems:
1. Click on the Start menu.
2. Enter dxdiag in the Start Search field and press Enter.
The DirectX Diagnostic Tool should open and scan your configuration. When it is done...
3. Click Save All Information.
4. Save the file to the desktop.
5. Email me a copy of that file.
Please also include a link to this Discussions thread and the username you use here.

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Message was edited by: germanintheburgh

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Thanks for your feedback. We are tracking a similar (if not the same) issue on this forum post. We have been in contact with some users and are continuing to investigate the problem.
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