(edit) I think the new kernel install has left a few things incorrectly configured.
You might try re-installing dkms and anything with xorg and nv in the name.
Then recheck your settings for the display and display manager (kde, gnome, etc). (end edit)
You can get the nvidia drivers for linux from nvidia.
The legacy kernel is meant for very old systems, you may want a i586 processor(pentium class or better) variant.
same goes for the nvidia drivers, amd64, ia64 are for 64bit kernels, either amd or intel processors.
ia32 is for all 32bit PC processors
You won't need dkms for the graphics after this, but it may be required to load some other module for the kernel at boot time, so be carefull cleaning up afterwards.