Your trying to install a network printer shared from a print server? does it prompt for credentials when it tries to install the driver
How exactly are you trying to install the printer?
My usual method is to go to \\printserver\ and double click on the printer. If you do not have the proper access windows will prompt for admin creditials when it tries to install the driver.
If this is the way you are doing your printer installs I dont believe there is a way around it, there may be a gpo you can push out for local computer policies. If your using win2k8 server, you may be able to push printers out using the new GPO's in win2k8.