SP3, SP4 keyboard, W10, Windows Defender is the only AV, no tricky software My one-and-only USB port provides power, but does not "see" common USB devices (external drive, digital microscope, etc.). Those devices work properly on another computer. I really need that digital microscope, which is claimed to be Windows 10 compatible! Control Panel > Device Manager produces only one yellow exclamation point: UTAX WIA Class Driver. No update is available. I wiggled the connector. I examined the interior of the female USB port (with the digital microscope connected to another computer) and see nothing unusual. ??