Video playback ISSUES in iTunes

Hi, All.
I've recently purchased a music video and a movie from iTunes to play strictly in iTunes--I don't have a video iPod.
I had assumed that these videos would playback smoothly with the iTunes software, but I was OH-so-wrong.
At first, the all I could see of the video was a halting, pastel-shaded blob. I consulted the Knowledge base, and did everything listed here: http://docs.info.apple.com/article.html?artnum=303706
Now, I can see my videos, but they are halting and out of sync with the words. I've upgraded my video drivers, display settings, and just about everything else I can think of, but I still do not have seamless video playback.
Any ideas? Suggestions? Remember, I have done everything listed in the above link.
Thanks for your time and help!
K7N2 Delta L w/2.2 Ghz AMD   Windows XP Pro  

"Now, I can see my videos, but they are halting and out of sync with the words. I've upgraded my video drivers, display settings, and just about everything else I can think of, but I still do not have seamless video playback."
Hey Feenix,
So, what version of iTunes is running on the computer? 7.0.2.16? Also what version of Direct X is installed on the computer?(goto Start> Run> dxdiag)
This article: http://docs.info.apple.com/article.html?artnum=93610 will help troubleshoot audio issues. The article will have you edit "Sounds and Audio Devices" through Control Panel; make sure Sound Playback Default Device is set correctly(under Audio tab.)
Jason

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