I had the message 'the last usb device connected to your computer malfunctioned' popping up continually - even though there was nothing plugged in at the front, and only the mouse and keyboard at the back. I tried everything from checking all the drivers ( all good but refreshed anyway ) to backing off from the latest windows 10 build to the previous build, to doing a windows reset. turning off and disconnecting -I tried every single "solution" I found on the net for this but the message came back in a loop every 30 seconds or so regardless. Finally I used a freeware product called USBdeview v2.8 from www.nirsoft.net this told me that port 4 hub 3 had an unknown device descriptor error. I think Windows device manager gives the same information. I then restarted the PC HP 6300 SFF elite continually pressing the ESC key to get to the BIOS Settings, I went to USB Security, and disabled port 4 and saved the setting. When I restarted the message has not appeared again. I vaguely recall pushing a USB plug in the wrong way in port 4 sometime previously. My conclusion is that I have damaged the wires inside the port, perhaps 2 wires inside it are now touching - which causes the malfunction even though nothing is plugged in that USB. I suspect that is the cause, not a bad driver. I suspect a damaged USB plug is the cause of the dozens of messages across the internet, on many makes of PC, about USB malfunction , when nothing plugged in. My next step is to take out the front USB panel and see if I can find something to correct. If not I guess I will leave that port disabled. Hope this might help others who have been scratching their heads over this one.