I have been using Lexmark X3650 All-In-One on my Windows Vista Desktop PC for a year without problem. Yesterday, I was prompted to plug in the USB from the printer and after that I got errors: "The USB device has malfunctioned." ,"The unknown device has been installed unsuccessfully.". Then, the printer just stoped responding. I have uninstalled the driver from Device Manager and software (using Lexmark's clean utility), rebooted, reinstalled, same thing, tried different ports/cable. Vista displays these two errors stated above immediately upon plug in. Please help me!