The “Object Reference” error can occur when the Nancy Drew Central file becomes corrupted, often by installing an older game after a newer one. To fix it, delete the Nancy Drew Central folder, located here: C:Program FilesNancy DrewNancy Drew Central. Make sure to only delete the Nancy Drew Central folder.
After the folder is deleted, you will need to uninstall your latest Nancy Drew game through #24, The Captive Curse. Then reinstall the game as normal. This will also reinstall Nancy Drew Central, and should fix the problem.
Beginning with game #25, Alibi in Ashes, Nancy Drew Central is no longer used to launch our games. Read more about the Nancy Drew Central retirement here, and learn the other ways you can play your Nancy Drew games.