Windows Movie Maker started to lock up while I was using it. I saved everything and exited and then opened the program again. When I opened up my project, the video(s) were missing! on the right it said "browse for videos" and on the left it has the preview of the video "screen" but without any video to play. It shows the length of the video, but when I play it, the preview is just black.

Please help because this was a project for school. I was almost done and now it is gone ;(