I have Windows 8.1 and I was putting 3 video's together on Movie Maker so I could put them all on one disc and have them automatically play one after the other. I noticed when I added the first video there was no sound. Since I hadn't used Movie Maker before I didn't know what to think so I continued putting the movie together.  After it was complete and saved in the "suggested format" there is still no sound.  When I play the original video's in any media player the sound is there.  Any suggestions on what I did wrong?