I still cannot read USB jumpdrives when plugged into the USB ports plugged into the MB. When USB drives are plugged in they do not register in Win Explorer. I have a PCI card to provide 2 USB 3.0 ports and I can read USB sticks plugged into those ports.
Weird I had some USB ports go on me yesterday, similar problem
From device manager right click the USB ports and select uninstall. Once they are all uninstalled then reboot and try again