I have Win ME and an HP OfficeJet 600. I have the latest drivers, and installed them. However, after several OS problems and a restore of my system to original factory settings, my PC says that a printer is already installed when I try and re-install the driver. It is not installed. I even removed all files from the directory. How can I "uninstall" this driver. When I try and uninstall through the control panel, nothing happens.