Windows Vista : Problem with Windows Movie Maker Vista?

I was using Windows Vista Movie Maker Version 6.0, and when I tried to preview the timeline, the preview screen wouldn't work. It has been working all night, and I can't think of anything that I did that could have affected it. I did notice that the numbers under the preview screen are grey.

save your work in a new file ie original_file_name__SAVED_Version1.extention

Reboot

Try again