IDT High Definition Audio CODEC

I have a gateway with the sigma tel sound driver that is preventing the update to sp1. I installed this windows update, which is some manner removed the sigma tel driver. I contacted gateway chat support, who pointed me to an unsigned driver on the gateway site, which I downloaded, this provided instructions to reload and I got sound back. HOWEVER, it remains to be seen if windows update will then "find" the sp1 update for me, one concern already, when I reselected windows update, it found the same IDT CODEC update already installed on the machine.