Hi,
Some motherboards allow disable in BIOS, others require a jumper to disable someting, and others require a jumper to enable the BIOS setup to manage the resource.
Printer ports are usually assigned via BIOS setup, on IRQ 7 and i/o port 378, a second port will usually go to IRQ 5 and i/o port 3BC. To see if the BIOS setup will actually disable the onboard device, set it to disable then uninstall the printer port from Windows Device Manager, then shut down and see if the 'new hardwarefound' wizard runs at the next boot. If not, then the BIOS disable did work, so install the new card and carry on. If not, rely on the motherboard manual or set the new card to use an available IRQ and install it as the second port --> Lpt2: ...