Both in Windows XP and Windows Vista,(along with Windows Server) they don’t make it easy to remove print drivers from a PC. If you are having particularly difficult problems with a print driver, and you need to roll it back to and old driver, Windows will once and a while block the ability to install an older version.
So, you have to remove/uninstall the old driver, and you do this by simply going to your Printers and Faxes folder in the control panel of Windows XP, Windows Vista and Windows Server. Depending on your view there may be different ways of getting there. Once you have gotten there though, you go up to File>Server Properties, and you’ll see your list of print drivers there. From there, you can remove or replace as you please.