Re: Lenovo W510, Quadro FX 880, kernel 2.6.35 x86_64 and Nvidia 256.*
Doesn't CentOS provide it's own packages with nVidia drivers? If not, try running the installer like "sh NVIDIA... --kernel-source-path=(path_to_your_kernel_src)"
If that doesn't help, try running "zcat /proc/config.gz > .config" and "make prepare" in the kernel sources directory. This usually works for me on Arch, dunno if there is something CentOS specific.