I don't know if something else is relevant to the warning message. The 2 USB ports at the back of my CPU are taken up so my Epson CX6400 Multi Function has to be connected to one of the spare ports at the rear of my Microsoft Intern et Keyboard. The first time I used the printer a message came on screen saying:
Hi-Speed USB connection connected to a non hi-speed USB Port. Printer seems to work fine. Doi not know whether I should get a "doubler" device so that the printer can go at the back of the CPU or not or whether it can stay connected to the keyboard.