Does the computer have Windows Vista on it?
If so, that is correct. Lexmark does not have a Vista driver for the X63.
However, many people with Lexmarks (and other non-Vista supported models) have had success using Windows 2000 drivers on computers with Vista installed.
If you have Windows XP installed, or if you have Vista and want to try the Windows 2000 driver, they can both be downloaded here, directly from Lexmark:http://downloads.lexmark.com/cgi-perl/downloads.cgi?lxkprod=Lexmark+X63
Be sure to UNPLUG the printer from the PC before installing the software. ONLY plug it in once the on-screen instructions tell you to do so.