In the computers BIOS you can typically disable integrated devices. This is the best way of disabling this because it also frees up an IRQ. If you need any help with this, just post and im sure someone will help you
or disable it via device manager, but the bios isnt that hard to figure out. when you switch on your computer press del, f10, f12, or w/e the key is to get to your bios, and it should then be pretty self explanitory