Opening mov files - weird color patterns + freeze

Hi,
Suddenly when opening mov files, quicktime shows weird colors instead of a video. It also takes a long time to open, and quicktime then hangs. I don't know what I installed that could have caused the problem. I tried reinstalling but that doesn't help.
I use vegas as video editor, and there I can still import quicktime movies without problems.
It used to work before on my xp64pro!
Any help would be greatly appreciated.
wouter

it might be worth checking to see if you can just get away with disabling Direct3D accleration on the PC. it's also probably worth checking your video drivers too.
the following document has some nice pointers in those regards. (iTunes uses QuickTime for video playback, so the same basic troubleshooting techniques apply.)
Troubleshooting iTunes for Windows video playback perfomance issues

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