Help with Movie Maker edits

Please help I'm so frustrated!  I edited parts out when using Movie Maker, but when I save the movie as a MP4 or a wmv, all the parts I edited out are somehow put back in.  When I go back to the Movie Maker project, they aren't there.  They only show up when I save the movie.  How do I keep the edited parts out when I save it as a movie!