Hmm, here are "thousend" of threads dealing with this problem....
Anyway, (apt-)get the your kernel's "kernel-source" package, use it to build your own kernel. After you booted it up run NVIDIA-Linux-x86-1.0-6629-pkg1.run again and everything (will) hopefully work.
(nice kernel compiling tut:
(although, it's a bit out of date)
... Also check out google, or the forum search... )