In an Active directory environment, under windows 7 – users get prompted for the driver when installing a new printer (even if the printer or driver has been installed before)

and since users don't have admin rights then they are unable to install the printer driver.

You can fix this by creating a GPO

Configure Group Policy settings for "Point and Print" on BOTH computer and user settings (Vista previously only had user settings). The Location of the settings can be found here in GPOs:

• Computer Configuration\Policies\Administrative Templates\Printers\Point and Print Restrictions
• User Configuration\Policies\Administrative Templates\Control Panel\Printers\Point and Print Restrictions

Source: From this Microsoft Technet Forum Post