Nvidia and nomodeset kernel parameter

I continue to have no luck with the 260.19 driver. When I install it and reboot plasma crashes with floating point exception. I tried submitting a bug report but the Run dialog crashes before I can type a letter and keeps crashing every 3-4 seconds. I finally give up with alt-ctl-backspace. Here are some pertinent facts:
opensuse 11.3
kernel 2.6.34.7-0.5-default i686
KDE 4.5.3
GeForce 7600 GS

My installation method was to:
check the KMS entry to be sure it is as directed here
download 260.19 from the nvidia site
drop to init 3
type su (and password)
type sh NVIDIA etc
answer all the questions in the affirmative
type reboot
at the splash screen, I leave the vga parameter as-is and type (a space, then) nomodeset behind it; click on the regular (not failsafe) opensuse login.

I get the crashes listed above. Rebooting to failsafe gives the same result. I then follow essentially this procedure but install the 256.53 driver and my desktop comes back.

If I’ve made an error, please help me to correct it.