I have a problem with the Lethal Weapon DOS game.

Each version of the game, including the original one I own, does not go further from the intro screen.

The intro just repeats itself and it doesn't respond to any keypresses from the keyboard.

What is the problem with the game? Is it just badly coded or is there something else I'm not aware of?

When the intro screen is shown, what keyboard keys should I press to get started?