Can you help please

[gregspappy]

I have a dell 530 S with vista 64 bit. I am waiting on my new video card today. I have never changed one. It has a G33/G31 video. I downloaded new driver to desktop just to get ready. How do I get rid of the old driver and put the new one in? The install of the card would seem easy enough for me. But the rest of this stuff (uninstall driver/install driver) I have not a clue. Could someone walk me thru the basic process.Thanks