I was working on a video at school using Windows Movie Maker, I wasn't finished but I emailed it to myself so I could finish it at home. When I returned home and downloaded the file, it worked fine. When I opened the file, however, none of the visuals showed up. The audio plays just fine but it says that the visuals were not found, that it's a missing file.

I used the same exact program both times but it isn't working for me and I need to know how to fix this problem ASAP.