Video stops playing halfway in Windows Movie Maker! :(?
Windows Movie Maker is very flaky. I use but with a grain of salt as the saying goes. If you are using a computer not generally set up for media type things, it may not be able to handle it. Or WMM doesn’t like the video file despite it being able to import it. I would recommend converting it to the same format and try it again with WMM. This will shell out any problems the file may have had that the program didn’t like. Good luck.