There is no Vista support for a printer built years ago long before the introduction of Vista.
This printer was built for use in Windows 3.1 and Windows 9x and nothing more. Vista hadn't even been dreamed of at that time. Compaq/HP is too busy building new printers and writing drivers for them. And besides, hardware design prevents this ancient printer from even working in Vista os. Windows Vista like's to see a USB printer connected with a bit newer technology.