need help on windows movie maker!! please help :(

I have been making a video for about 3 days now and it was working fine but when i went on it today it just zei "Movie Maker can't open this project file.The file may not be compatable with windows live movie maker of be currupted" then says "Error 0xC00CEE2D" if u know what i could do to make it work please tell me, it has never done this before.

thankyou :) xx