New
#61
in Control Panel>Programs there is Device Software for the HP OfficeJet Pro 8600. I was somewhat reluctant to remove it because it is the only printer which the HP identifies as installed and I asked it to install the driver a few days ago and it seemed to do it. But I still could not print on it. I did however try to delete it It started but stopped twice with error messages saying it could not delete. In Device Manager there are two unidentified printers. They cannot be deleted. Uninstall does nothing. No option to remove driver. The option to install driver searches but cannot find one. In Windows 10 Device Manager is not in Control Panel but in Settings. It is as before.
Sorry but no progress.