Windows XP - motherboard with a built-in sound function (RealTek) but this does not work although XP recognises it. I have installed a new sound card and it works. However, when I reboot XP recognises and wants to install old (not working) built-in sound system. This stops the new sound card working. I want to totally disable the built in sound system on the motherboard so that XP won't "see" it and then the new card will work. How do I do this please?