Did you install the nVidia restricted drivers? If so, open a terminal a type "sudo nvidia-settings". This should start the nvidia x server settings application as a superuser. Click on the "x server display configuration" tab. Here you can configure your two monitors. I think you need to enable "TwinView" mode and then set one monitor as the primary display and then set the other monitor to left or right to your main display. Hit "Apply" to test your settings. When you are happy make sure you write your click on "Save to X Configuration File".
Hope this helps.
The instructions suggested Windows XP or better, so I installed Linux :)