I just created a video from a narrated PowerPoint 2013 presentation, and now I'm trying to edit it in Movie Maker. While the video seems to load just fine (I get the standard message about preparing the video for Movie Maker when I open the file), it won't play when I hit the play button. The rest of the application seems to be non-responsive as well, even though it says it's running normally in the Task Manager. The video is ~14 minutes long. Is that too large or something?