Saved Movie Will Not Show Titles, Photos, or Video

I have been working in Windows Movie Maker (2012 version) for a while now. I have tried saving my movie various times, each time with a different setting, but I get the same problem every time. The audio plays without a problem, but neither the pictures nor the titles show up. I also used an AVI video which also does not show up, but I can hear the audio from it as well. I had originally used JPG images, but with further reading, I changed the file type of all the pictures I had used to BMPs. I thought that would at least fix the picture problem but it did not. I don't understand why the titles are not showing up at all. I'm planning to save this movie onto a thumb drive so I'm not sure of the best way to save it. I don't know what else to try. I have spent hours getting this movie exactly how I wanted it, and to not be able to finish it would be extremely disappointing.