We have 1 XP pro workstation on a network of 20 computers that the printers just disappear. There seems to be no reason for it, when you go to print the printers will be gone. Not all the time, just a few days after installing them. When they disappear all you have to do is reinstall them. There are no errors and once you install them they work fine, until the time you go to print and they are gone.