Hi Junkmendall,
Welcome to Microsoft Windows Vista Community site.
Some audio and video file formats are not supported in Windows Movie Maker and cannot be imported. Movie Maker is not compatible with QuickTime .mov files. However, if you have a video or audio file that is not supported, you may be able to use a non-Microsoft video editing program to convert the file into a format that Windows Movie Maker supports for which you need to perform an online search for video conversion software to find one that fits your needs (check the file formats which are supported by Window Movie Maker http://windows.microsoft.com/en-US/windows-vista/Import-video-files-pictures-and-audio-into-Windows-Movie-Maker) , and then import the resulting audio or video file into Windows Movie Maker. Some files also require you to install a codec before you can use the files in Windows Movie Maker.
IMOPRTANT NOTE: Using Third Party Software can cause serious problems that may prevent your computer from booting properly or may result in some serious problems. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.
Let me know if that does or does not work. Good luck!
Hope this is helpful.
Thanks and Regards,
Vijay K - Microsoft Support
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