I need help fast,
Have been working for many days and nights on this project(that is worth a huge portion of my grade) for my civics class using moive maker, I saved it and shut down my computer last night - today I went to open the project and a message pops up saying "Sorry, movie maker can't open this file. The file might not be compatible with Windows Live Movie Maker or be corrupt. Please select a different project file." 

VERY FRUSTRATED&DEPRESSED -
Please help ASAP. 
Thank you,
Amir Thomas.