you have to go into the computers bios/setup. You do this when the computer is powering up before windows, you will se a prompt telling you to press a certain key to go into setup, it's normally F2, or F1, or delete, or sometimes enter.
When you're in the setup screen you need to find the parallel port settings, which are usually on the second page or in the advanced page. Look at the settings and it will probably be ECP, just change it to EPP, then save, then exit.

PS. if you see the windows logo, you've missed the prompt and you'll have to try again