When I try to play files or video in Windows Movie Maker it just shows a black screen, no sound either. I have used Windows Movie Maker no problem in the past and now it won't even play videos I have made previously that worked fine. I have downloaded the latest version of Windows Movie Maker and checked the video card - I still have the problem. When I upload a video or video file into Windows Movie Maker to edit it is no longer showing the loading bar that it used to show to indicate the video was loading in. What can I do?