if u buy a new graphics card, is it just a case on switching the cards, booting up and installing the new drivers? surely if ur card doesnt have n e drivers you wouldnt see n e thing on the monitor when you boot up?
If you're going from nvidia to nvidia, no problem. Or ati to ati, no problem.
If you're going from one to the other, you have to remove all traces of the original drivers BEFORE you put the other card in. Nvidia's drivers are pretty coopperative (I'm told) and clean up after themselves. ATI's aren't, so you need to get their uninstaller (it is a stand-alone uninstaller). No matter which you do, be sure to browse through your registry to make sure that nothing is left there, as well as browsing your harddrive to make sure that nothing was left there either.