Do an "lspci" and copy the nvidia card line here.
http://www.nvidia.com/page/vanta.html
... that vanta uses TNT architecture.
Linux drivers supporting TNT and TNT2 are in the nvidia-glx-legacy package. If installing that package with apt dosn't work, give up.
Cannot find the product on the driver
support page but nvidia list the vanta as a legacy technology.
Note: reviews are bad if you want compiz, this card won't cope.
http://ubuntuforums.org/showthread.php?t=386663