If you're going to replace an integrated item with an add-in card, always disable the integrated item. Don't think that's an official rule or anything (
) just a rule I always follow. If I'm using an add-in graphics card, I disable the integrated graphics if there are any. If I'm using an add-in NIC, I disable the integrated NIC (unless I plan to use it for ICS or something), etc.
Disable the on-board audio Bob. Remove all drivers for the onboard audio, Bob. Then install the latest drivers for your sound card directly from Creative's website, Bob.
Oh, and you're welcome Bob.