Complete malfunction under Win7 and Win XP!

Will return the stroke again, the part does not work on desktop PC with Windows 7, and the netbook with Windows XP as well. "Exceeded USB power consumption" is the error message, even if only one device, which consumes as good as no electricity is connected. Or the USB devices are not even recognized when connected to the hub. Directly connected to function the same devices properly.
Since the stroke on two different computers Problem solving with two different operating systems, it is likely to be at the hub.
My conclusion: a waste of money!