Hi Michelle.
Hocus Pocus is a DOS game, so if you're using Windows Vista or newer (or almost any other non-Windows operating system) you'll need to run it in an emulator like DOSBox.
Here's a tutorial on using DOSBox.
And, just for you, I've just added a list of other ways that you can run Hocus Pocus on your computer,
here.
Today entirely the maniac there is no excuse with the article.