Remove the old card and insert the new card. On boot up you'll have basic resolution. Run the CD with the drivers. No need to uninstall the old drivers, they'll just sit there and be available in case you have to put the old card back.
I just purchased a nvidia geforce fx 5200 video card. I downloaded the drver for it and transfered the file to disk. I have a Dell Dimension 4500 series that is nearly 4 years old now, running xps2. My question is...do I need to disable or uninstall the driver for my old card ? And which comes 1st, install the new card or the driver ? Thanks