The information in this article applies to:
Desktop Authority 8.x and up
How to ensure Windows 7 64-bit machines receive network printers
Windows 7 64 bit machines may fail to map network printers.
The most common reason for printers failing to map on a Windows 7 64 bit workstation is that the printer driver is not compatible with the operating system.
Create a printer on the print server that uses a 64 bit printer driver. Create an element in Desktop Authority for the printer you created. Set validation logic on the new printer: Computer Information | Platform Type | 64 Bit Platform.