Im just a newbie myself, but heres some suggestions while you wait for someone who knows what they are talking about!
Have a look as see if "/lib/modules/2.4.18/" exists.
Does "/usr/src/linux" or "/usr/src/linux-2.4.18-blahblah" exist? This is where the source code goes.
Have you tried to so a "modprobe emu10k1" to see if you have the sb driver already?
Thats all I got