Hi
I was having the same problem, I fond the the answer go to the following
site, it is very simple step. Mine works I have just created my first movie.
hope it helps

http://www.microsoft.com/windowsxp/u...easenotes.mspx



"sltarken" wrote:

> I have my Windows Movie Maker completed on my PC. It looks and sounds great.
> Both still and movie clips are included. However, when I follow Movie Maker
> instructions "To Save A Movie to CD", I receive the following error message:
> "Cannot Complete Save Movie Wizard. This project contains source files that
> are missing or that have been modified after import. Your project cannot be
> saved as a movie until the source files have been located or deleted from the
> project."
>
> All the still photos, movie clips and sound are on my PC. However, some may
> be in My Pictures and not in Movie Maker. Do I need to physically put all
> photos, movie clips and music into Movie Maker? I can play the movie on my
> PC and it plays beautifully. Its only when I try to Save to a CD that I
> encounter this problem.