I had a hp deskjet 5440 printer installed on window 7. Then I installed a HP PSC 1500 to use its scanner, which worked fine. Then I tried to use the 5440 printer and now neither printer will print. I've totally removed both printers and all drivers from registry and reinstalled. They still wont work. All drivers are installed. Explorer says "this device is working properply" and the port is set to lpt1. When a I print a document, it says an unknown error occured. When I try to access the printer's print properties, its says driver not installed event though I watched windows uppdate install it sucessfully. Any Ideas?