Message "Do you trust this printer?" an how to solve it

When installing a printer on Windows 7 or newer the printer installation process hangs. If you manually try to install the printer on the workstation using the Add Printer wizard, you will be prompted with a security prompt asking "Do you trust this printer?".

This error can happen when the printer got an driver which is not "packaged". On the print server open the "Print Management" Snapin and take a look into the drivers section. You will see a column called "packaged" and your "buggy" driver will have the entry "false". 

To change this value you have to find a packaged driver from the printer vendor or try the steps below:

1. Install the required drivers on the print server
2. Edit the registry on your print server and go to the following locations:
3. For 64-bit drivers: HKLM\System\CurrentControlSet\Control\Print\Enviroments\Windowsx64\Drivers\Version-X\{Driver Name}
4. For 32-bit drivers: HKLM\System\CurrentControlSet\Control\Print\Enviroments\Windows NT x86\Drivers\Version-X\{Driver Name}
5. Where "X" is the print driver "Type", usually either "3" or "4"
6. Edit the key named "PrinterDriverAttributes" by adding 1 to whatever value is currently set. (Example: if the current value is "6", change it to "7".) This will make the print server believe that these drivers are packaged.
7. Do this for every driver that is not listed as a "Packaged" driver.
8. Restart the print server.