Your video card needs the latest driver from nVidia to reach the resolutions that you need.

Try google for: Linux nVidia Installer


Easy to install package should do the trick but you will also need the contents of the /usr/src/ directory from the *DVD*. This directory contains the needed Kernel source tree for compiling programs.

Just boot from the LiveDVD and cp /usr/src/ to /usr/src on your current install



Take Care,
-Justin
One Mynds Eye