the problem might be Of the hub in which u r putting it into.Chang the port u r inserting in.if this doestn't solve ur prob then Check in the device manager For unknown device or some kind of yellow thing...written as unknown device.
next u can aslo do is discoonect the power supply from ur CPu,this is because due to static current may have set around ur ports.
the last thing u can do is try some other USB components