How can I update the printer drivers to fix the 0x0000011b error?

You can update printer drivers on either the print server or the Windows 7 client. On the print server, go to the 'Devices and Printers' section, right-click the printer, and select 'Printer properties' (or 'Properties'). Then, go to the 'Advanced' tab and choose 'New Driver...' to install or update to a newer driver. On the Windows 7 client, you typically install the printer, Windows then tries to find the correct driver. If not found, you'll need to browse to a driver manually, downloaded from the printer manufacturer.