If the game locks up when you set the time on the Grandfather Clock, you have gone past the time needed. The game is not set up for this. You will need to restart the game. When you get back to the Grandfather Clock after restarting the game, set the Clock to exactly 11:15. If you go past this time it will lock up again.
Other problems:
Casper: The Interactive Adventure has no other known troubleshooting issues. If you have followed all the above instructions and are still having problems, you may wish to call us at the number at the top of this page and request one of the following general troubleshooting documents: