Can't export MP3 audio or WAV files

I just started a new project on MuseScore and when I go to export my MP3 audio file it only goes to 38% and the software shuts down. When I try to restore it, the file comes back as "The file does not exist or cannot be accessed at the moment". This is the first time that I have had any problems with your software, and I need it to do my music production. Any help would be appreciated.
Brian