I suspect that the VSP files

I suspect that the VSP files are not compatable with Windows Media player. You need to save your videos as mpeg 4 files at the very least. Try playing the file with VLC media player or Quicktime. If it still won’t play you will have to save it to a compatable format. DVDs themselves use the MPEG 2 format for picture and MPEG 1 for the audio.