I cannot save my movie in Microsoft Windows Movie Maker 2

I made a movie using Microsoft Windows Movie Maker 2. However, I am having problems saving the movie because it would freeze when I try to save it and an error message would pop up saying "Windows Movie Maker cannot save the movie to the specified location. Verify that the original source files used in your movie are still available, that the saving location is still available, and that there is enough free disk space available, and then try again." How can I fix this problem and save my movie?
