The Creative Labs kit comes with the IDE Interface set to the third IDE port by default (IDE2, I think). This won't work under Linux as it only recognizes two IDE ports. What you need to do is move a jumper on the card to configure it for IDE1 (the secondary IDE port). I'm not sure if you have to make changes under DOS for this configuration to work, but your manuals should help with this (it will still work, but you may have to edit a file or two).
You may also have to specify command line parameters like:
boot: linux hdN=cdrom
If you have one IDE drive, N is most likely ``b'' in this case (ie ``linux hdb=cdrom''). If you have two, then it will be ``c''.