I have an HP Deskjet 3915 USB that wouldn't print. So I un-installed and re-installed and when it came to the part to plug in printer, I did and nothing happened. Windows XP home wouldn't recognize it. So I took it to another XP machine and it installed and printed fine. Does anyone know of anything else to delete before trying to re-install so that XP will recognize this usb printer. Nothing shows up in the device manager when it is plugged in or unplugged.