You'll have to use the Vista drivers for your GPU, from NVIDIA.
Servers usually don't require advanced drivers as they are not intended to run with any decent graphics for the user/admininstrator. Often there's only a tiny monitor for the administrator to use and more often than not servers run headless (without a monitor).
Just for interest sake, each one of the "draws" in this pic of a server farm, is a full standalone server computer and one has to plug a portable monitor and mouse and keyboard in if one wants to "see" it's OS or one can access it from a remote terminal.
"The great majority of mankind are satisfied with appearances, as though they were realities, and are often more influenced by the things that seem than by those that are." - Niccolo Machiavelli