I have the same motherboard just like yours, but i can install the ethernet card.
I have try, on the konsole, the command "make", on the tar file, and it have give me the following error:
[root@localhost nforce]# make
make -C nvnet
make: Entering directory `/home/feiticeiro/Desktop/Claudio/nforce/nvnet'
cc -c -DLINUX -DMODULE -DEXPORT_SYMTAB -D__KERNEL__ -O -Wstrict-prototypes -DCONFIG_PM -fno-strict-aliasing -mpreferred-stack-boundary=2 -march=i686 -falign-functions=4 -DMODULE -I/usr/src/linux-2.4.21/include nvnet.c
make: cc: Command not found
make: *** [nvnet.o] Error 127
make: Leaving directory `/home/feiticeiro/Desktop/Claudio/nforce/nvnet'
make: *** [nvnet_make] Error 2
I have thy with the rpm file so, but it says the the command "rpmrebuild" it's not valid...
Have any clue about this to help me?