Don't worry, I have the same problem, am working on a solution and once I have it working, will tell you.
Basically you ignored a warning message when seleting the updates, that users using the pre-compiled binary version for the SuSE 9.0 version (using by default the kernel 2.4.21-99-athlon i.e. revision 99) will have to recompile the nvnet and nvaudio driver after the upgrade to the fixed -144 revision of the 2.4.21 kernel.
What's to do now is:
a) get the kernel sources and the nvidia driver as tarball (*.tar)
b) transfer them, i.e. via usb stick or CD as they are large
c) install the sources and upack the tarball
d) recompile the kernel-modules as described on the nvidia pages
e) try using the module with modprobe nvnet
reboot. done. good luck
- Updating your Kernel with RPM Packages
- nForce Linux Driver Release Notes
- Linux nForce Driver
- SuSE Mirrors
need kernel-source-2.4.21-144.src.rpm + the one for athlon