Which Creative cards do you use?
I'll have to play with mine at home (I have one higher-end older Creative card), and it is on XP, but some of the mixers will allow you to change and assign all of the inputs and outputs.
If you do that, and use the "Creative Player" (do they still make that?) then perhaps it can be set to use the cd-in to the card for playing the cd.
I know I did some funky stuff with midi and those dedicated cd/aux in/out pins on the card, to allow my MIDI keyboard to play voices defined on the computer back out to the keyboard's better amplified speakers.
In any case, look for a Creative Control Panel and Creative Player and see if you can find any hopeful looking options there.