I was working on a project and saved the file, but when I went to preview
that project, the preview screen stayed black. So I called mircosoft, this is
what he did.....
First thing you need to publish the video to your computer, under vidoes.
Then you can preview it on windows media player. Any other adjustments you
need to do for that project just open it up with windows movie maker, it will
still allow you to make changes. You need to publish it after you spend some
time on it. Saving it is ok as well, you just wont be able to preview. This
has worked for me since he did this. Hope this helps

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http://windowshelp.microsoft.com/com...pictures_video