I have a Hewlett Packard Laserjet HP4000 installed on a Vista PC. This is shared. When I install a printer on another Vista PC on the network and connect to that shared printer, I can print from that second PC but only for a short time. If I delete the printer and reinstall it, I experience the same symptoms. The printer driver for the HP4000 is obviously rather old and does not work perfectly, for instance you cannot successfully tell it to print multiple copies. That said, I can't understand why I can initially print but after that, I cannot.