|Glad you got it sorted.|
It's a common misconception, to think of the Movie Maker project file (MSWMM file) as being the rendered video file. I often come across forum threads, asking which program will play MSWMM files. It's a fair assumption to make (i.e., put video in, save video out), although an erroneous one.
If you need any assistance with future video projects, don't hesitate to ask for help. I check these forums most days, and would be only too glad to help, as I'm sure, would many of the other members here.
Please let us know if you found someone's advice to be helpful.