The disc begins to spin, then "The application Projector quit unexpectedly." I have already ran the program once and it worked fine, but now the second time i've put it in it does not work. I've tried the disc on a friends computer and it works fine, so there shouldn't be anything wrong with it. Brand new, no scratches. Any ideas on how to fix this? I have a Mac Book Pro, OS X, version 10.5.8