I created a movie consisting of photos and videos and then added music that I purchased from itunes.  It worked perfectly at first, but when I reopened the file to add more photos, the music shows in green, but no sound.  This is the first time I have used movie maker. I recreated the project several times and was met with the same situation when I opened the project to show someone.  In addition, when I open a project, I lose sound in my entire computer. Any help is appreciated.