ok here we go, it could be 3 things
1. if you are running big wav files over 40 mb than this happens. use mp3s or compress them in your movie when you go to export it.
2. your trying to run flash mx on an old computer mx is pretty dependint on cpu usage so stick with flash 5 for now
3. you are not exporting the movie. you are just pressing play and watching the internal player. internal player is shit. go to file->export movie
well i tried to help :-)
-Pretender_3000
Megaman uses energiser batteries for long running capabilities look hes still goin!!!