It's a query more than a problem. As we know Windows Update houses lots of drivers for Printers by default, and when adding a local printer, you can merely select from that list, point it to an TCP/IP and your network printer is setup.
What however in this scenario:
32Bit Server OS with a 32bit Printer installed. There are no manual drivers available on the manufactuer site since apparently "They are all available on Windows Update".
But obviously when you go to Additional Drivers for 64bit when sharing out the printer you can't point it to a driver that apparently exists in Windows Update.