Quicktime "jitters"  on a PC playback

Hi,
I use Final Cut Pro on a G5. The exported QT file looks good and plays fine on the Mac. When I play the file on a PC, it looks good, but there are artifacts during shots with camera movements (pans & zooms). Any suggestions?
I also have tried exporting avi files, then encoding those files to wmv (with virtual PC). The quality is a bit inferior to QT.
Any suggestions for settings, etc?
Thanks.
janis

I export the file from FCP as an avi file, with the DV/DVCPro-NTSC codec, with highest quality settings.
How are you playing the movie on the PC, from the hard drive or from a CD? And what are the PC's specs?
Do you happen to know about any wmv encoding plug ins for Final Cut?
Flip4Mac WMV.

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