Movie maker won't play my videos that were working previously and now has a black screen, I NEED HELP!! All of my drivers are Updated, I also tried converting the files, nothing is working.  Is there any way I can save the project into a video file because at this moment when I try to it says it can't save because it is missing files.   I really don't want to spend another 10 hours remaking this video.  There HAS TO BE A FIX!!!!
I have built a six minute video with about 30 pictures, 20 video clips, and 2 music files.  I have tried to save the movie in several different formats including the recommended format and every time I get the exact same response:

"There are missing or unusable files in your Movie Maker project that are preventing your movie from being saved. Please check that file preparation is enabled in Options, or remove the files and try again"

Each time the message comes up, however, it references a different video file as being the source of the problem.  

I am using Version 2012 Build 16.4.3505.0912

My video files are .MOV (From an iPhone and from a dSLR camera) and .MP4 (from a GoPro)

My photo files are .jpeg

My music files are .mp3

Please help!!!!!  Thank you
My camcorder program compresses the video file and attaches it to a Live Mail form, but when I hit "Send" I get an error message and it never goes through.  There are never any details specified as to why it fails, it just fails every time.  I can't get the attachment to go to my normal AOL mail, so I am stuck.