Can't Finish Movie on Windows Movie Maker!!! HELP!!!?

-I'm having a problem using Windows Movie Maker. It will not complete my video, and save it to my hard drive as a media file. I have the video completed, but it isn't saved as a single file, that I can save on CD's or play for people. I assumed that it was because it is a long video at 03:45 or something?



When I upgraded everything, though, I thought it would work. The problem still exists, and I can't figure out what's wrong.



Here's the issue: when I click on the "Save to my computer" option, I make the file name "Pablo Francisco - Sims 2," and then set a directory to save it to (in this case "My Videos"). I click "Next" and then select "Best Quality for playback on my computer." It also tells me that the file size will be approximately 32.09 MB and that I have 240 GB free on my hard drive.



When I continue, it goes to the "Saving Movie" screen, and estimates the time remaining. Nothing happens next because it tells me: "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, then try again."



All of the requirements are met... I have the source files (the videos and the music, as well as the WMM work files). There is enough space on my hard disk, and the C:\ directory DEFINATELY exists.



PLEASE, PLEASE HELP ME I'M BEGGING YOU PLEASE!!!