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This is not an issue I have seen before.
Just guessing.....
Maybe you have a problem with incompatible
source files.
Many formats are reportedly compatible with
Movie Maker but the most reliable choices are:
Photos - bmp
Video - wmv or dv-avi
Music - wma, wav, wmv
Or...you may need to update your video driver.
It may be worth a try to reduce your Graphics
Hardware Acceleration as per the instructions
in the following article.
XP...
(272193) PI: How to Troubleshoot
Graphics Issues
http://support.microsoft.com/default.aspx?kbid=272193
(scroll down to:
Microsoft Windows 2000 and Windows XP)
If it improves the issue, you need to search the
support website of your Video adapter's mfg. for
an updated video driver.
In either case...be sure to return Acceleration
to full.
Good luck...
--
J. Inzer MS-MVP
Digital Media Experience
Notice
This is not tech support
I am a volunteer
Solutions that work for
me may not work for you
Proceed at your own risk