OK, first before we can do anything, your probably going to have to install the Nvidia PROPRIETARY drivers in order to use your card. As your video card is extremely old, dates to like 2004, your going to need a much older driver to well, drive the card.
CTRL ALT T to enter terminal
sudo add-apt-repository ppa:graphics-drivers
sudo apt-get update
sudo apt-get install nvidia-driver-306.97
I believe that was the last driver that supported your card officially.
Once installed, click Zorin 
icon and type Additional Drivers. Open that up. Hopefully you see Nvidia 306 PROPRIETARY show up in the list. Make sure its selected, wait for install to complete, then restart.
Your card is really old, and this may still not work because of its age, but we can cross our fingers and hope that this works.
StarTreker
Community Tech Support