How to Restart a USB Hub
Universal serial bus hubs are commonly used to connect accessories such as keyboards, mice, music players and webcams into a computer. If the computer won't recognize or respond to devices plugged into the USB hub, the USB controller may have entered select suspension. With most cases, restarting the USB controller and computer should solve this problem. If it doesn't, contact the Microsoft Support website for additional help and details.
Click "Start" in the lower left corner of the desktop.
Select "Control Panel" and choose "Hardware and Sound."
Click on "Device Manager" under the "Devices and Printers" section.
Click on the arrow next to "Universal Serial Bus Controllers."
Right-click on the hub that needs restarted and select "Uninstall." You can choose more than one if necessary.
Restart the computer. Windows will automatically reinstall the USB root hubs. If the hubs still don't work, restart the computer again.