Allow Windows 7 Clients to Install Network Printer Drivers Without Providing Admin Credentials

Domain users on Windows 7 machines are normally prompted for administrator password when installing network print drivers. If you trust drivers on your own server and don't want to receive support calls every time user installs a network printer you can disable this behaviour using Group Policy:

Computer Configuration > Policies > Administrative Templates > Printers > Point and Print Restrictions
Set policy to Disabled.