Windows Movie maker, the final save

[GoldenElite0]

I've finished my movie. It has clips, text and audio (video placed in the
audio bar)
When I try to finally save it onto my computer, it says error check if
source files are still there, destination is avalable and enough space.

Well I have al lthese things, so whats wrong?

[GoldenElite0]

Also note, I can save it under a diffrent type of video. For this one I
chose high quality small. The clips are all black except for the last
four...confused? I am.