movie maker crashing when saving

Hi all,
I have recently started using Windows movie maker (on Windows 7) & found it easy & was working well.  Now, without changing anything, whenever I try to add audio & then save the file a box appears saying its stopped working then it crashes.  I can watch the clip perfectly in movie maker but just can't save it.  I've done exactly what I need to do before without problem but now this very basic task crashes.  I even did the exact same project I'd done prior to make sure it wasn't just a corrupt audio file.  I've re-installed the program so it is the latest version but the problem persists.   There seems to be hundreds of youtube clips about movie maker issues but I can't find 1 that addresses my specific problems.  Please let me know if you have any suggestions.  Thanks in advance.