@ RaimaKesar's repsonse (sorry couldn't help it)..
Well it is very "funny" because your card doesn't seem to be listed in nVidia's driver compatibility list. From the bug report it seems to have device ID 0x015d which Linux recognizes as "NV17GL [Quadro NVS]", but according to the lists I can find the only Quadro NVS that has NV17GL has ID 17A, and this is supported by the 96 driver.
Some others in the 015X ID series are only supported by the 71 driver.
It's always better to manually install the driver with the Nvidia installer if there are any problems rather than using a package. That way the installer may detect some issue and print helpful information.
I suggest you try manually installing the 96 driver and then try the 71 driver if that fails.
Try the following:
$ sudo /etc/init.d/gdm stop
$ wget http://us.download.nvidia.com/XFree86/Linux-x86/96.43.05/NVIDIA-Linux-x86-96.43.05-pkg1.run
$ wget http://us.download.nvidia.com/XFree86/Linux-x86/71.86.04/NVIDIA-Linux-x86-71.86.04-pkg1.run
Download both the drivers you're going to try with, and stops X (easier to download from inside X where you can copy/paste
. Now login to the terminal and continue:
$ sudo sh ./NVIDIA-Linux-x86-96.43.05-pkg1.run
Follow the prompts and complete the installation. They you can try restarting X:
$ sudo /etc/init.d/gdm start
If it doesn't work try the 71 driver instead (stop X first like above):
$ sudo sh ./NVIDIA-Linux-x86-71.86.04-pkg1.run
If that also doesn't work then I guess you can try the "nv" simple open source driver or the "nouveau" advanced open source driver.. but try the others first.