Endeavoring to establish a connection between my Vista PC and a Bose Sound Link (WIFI music streaming system) and for this a wifi aerial is plugged into the PC USB port. The result is no sound!!! It is understood that such a USB device will take preference over the connected external speakers. Checking the device connection via the Device Manager > Sound, Video and Game Controllers indicates the USB device to be connected and working correctly. Members help with this would be greatly appreciated. Is it possible that the sound card is not set to default and if possible how can this be done? Many thanks.