1) pls ls /usr/src/ and post output here.
2) can u find /lib/modules/2.4.xx/kernel/sound/pci/snd-intel8x0.o?
3) post u modprobe error here. if it is unsolved ...register_special_... unregister_special_..., then u need recompile the kernel and add sound core support. if it is wrong kernel version. then this is a old problem again.