I have been editing a movie in Windows Movie Maker.. I completed it and saved it in a folder but when I go to open it again in Movie Maker the clips all have big red "X"s in them and when I push play it seems to be playing with the timer counting but there is no picture or sound. The program itself seems ok as it will play other MSWMM files stored in the same folder. I had opened this file, done a minor edit then saved it. Has it been corrupted when I did this? What should I do now?