If you receive:
Unable to change to the specified driver. Original settings will be restored.
when attempting to change the driver on the Properties / Genral tab of a network printer, you may have to adjust the registry. If you print a test page and close the printer's Properties, you may also receive:
Printer settings could not be saved. The printer driver is unknown.
Use Regedt32 to navigate to:
Double click the Order value name in the right hand pane and move
Lanman Print Services to the top of the list.