Open Device Manager (right-click My Computer, select Properties, and Click Device Manager on the left). Expand the Universal Serial Bus Controller section. You will see a few devices called ‘USB Root Hub’. Click on each one and go to its properties. In the Properties window for each USB Root Hub, go to the Power Management tab and uncheck the ‘Allow the computer to turn off this device to save power’ option.
Here is an album of how it works: