I have a new (May 2017) desktop PC running latest Windows 10 vn1703 with 2 USB 3.0 ports on the front and 4 USB 2.0 ports on the back.
Device Manager only lists USB 3.0, i.e. one 'USB 3.0 eXtensible host controller' and one 'USB Root Hub (3.0)'.
Should there be any controller or root hub for USB 2.0??

I have read that USB 2.0/3.0 should be upwards and downwards compatible and yes, the keyboard, mouse and various memory sticks work in all the ports. However I have a USB 2.0 device (a Satmap) which will not work on this machine in any of the ports. It works fine on an older machine that has only USB 2.0 ports (and therefore controllers) running Windows 10 vn1607.
On the new machine, Device Manager knows the Satmap is connected (lists as USB Mass Storage Device under USB controllers, as USB Device under Disk Drives and also under Portable Devices) but nothing else can 'see' it - neither File Explorer nor the Satmap application software.
Running Troubleshooter (when it is already plugged in to a USB 2.0 port) just returns the message 'USB Mass Storage Device can't work properly with USB 3.0. If the USB 2.0 device is incompatible with USB 3.0, plugging it into a USB 2.0 port can solve the problem.'
Having read through various USB threads, I have tried uninstalling everything under USB controllers but that made no difference.
Any thoughts on what to try next will be gratefully received.