Do you want/use a grafic (X) login ?
The drivers can only be installed in init3 mode - no X server running ! If the X server ist running the nvidia-kernelmodule could not be changed - it's used. So if you come from a grafic login, you have to kill the X server (strg-alt-backspace)
If you want a grafic console - the framebufferdevice must set correctly. I don't know how to do this because I don't use framebuffers. I'm using vgamodes to display 40x80 char in consolemode.