OK, so I make a project with about twenty .JPG files and two .wav audio files. It lasts about four seconds. When I'm done I click "Save Movie" and I export it as a .wmv file. There are no error messages during editing or exporting. It says my movie has been saved successfully but when I try and watch it with Windows Media Player, it can't play the file and I get an error. I've also tried to save my movie as an .mp4 file, and I get the same error.

My OS is Windows 7 32-bit.