Hi Sharon,
You don't give us a whole lot to go on there. Here is an older thread that might shed light.
http://itsmygallery.com/ProShow/viewtopic.php?t=1330
The "Presenter" program can be contrary at times. Are you trying to view at various times of the day? Are you waiting for the show to dowload before clicking to play?
Do you have a high speed internet connection, forget dial-up to view shows. You might try unistalling and re-install the Presenter program.
Maybe someone else will have other tips for you, hang in there.
_Dan