I was recently using windows live movie maker when my video files started getting little warning signs. This was after about 30 minutes of me splitting, moving, watching and using the video files normally, they then started dropping like flies. When I double clicked on them, it said "the file might be corrupted or in a format that movie maker doesn't recognize. This movie can't be saved or published until [video name] is removed from the project." Normally I would just redo everthing, but every time I try to redo it the same thing happens. It's especially weird because the videos were working fine for a long while before they stopped. Please help.