Poor video playback with Windows XP

Hi all,
I am trying to play TV shows that bought from the ITMS (Xena & Star Trek remixed originals). I seem to be getting poor video playback performance. The video is briefly freezing and skipping. The frame rate is also not very good.
System specs:
2.6GHz P4 with hyperthreading enabled
2GB RAM
Matrox Parhelia 128 video card (latest drivers and firmware)
Soundblaster X-Fi Platinum
WinXP Pro SP2 + latest hotfixes
iTunes 7.2
I bought my first TV show after upgrading to iTunes 7.2 so I can't compare performance with v7.1 or earlier. I've tried playing the videos from a local IDE (D:, 60GB free out of 120GB) and from my 1TB Buffalo Terastation (RAID 5, 750GB). The performance is the same. The CPU activity varies from 75% to 95% CPU usage while playing the videos.
Even though my Matrox Parhelia is 3 years old it is still one of Matrox's top performance video cards and does excelent 2D and pretty good 3D.
Any help will be appreciated.
Thanks,
Steven

You're leaping to a conclusion that isn't supported by any facts. Just because you are having a problem is not an indictment of Safari 4. I'm having no trouble, nor are millions of other users, so that destroys your thesis. The problem is something that was a pre-existing condition on your Mac.
Did either of you Repair Disk Permission before and after installing it? If not, start with that. Do you have the most recent version of Flash installed? If not, download the Flash uninstaller from the Adobe web site, then the lastest Flash installer and run those, then restart Safari and test it on some video.

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