I recently took Internet connection in my PC.From then onwards whenever I use Internet my volume control shows the message"No active mixer device available.Go to control panel-add hardware-and add mixer device".I have checked my pc for audio devices they are all working fine.The warning tones and other windows sound works fine.Only whenever i try to play any media file no sound comes out.After I restart my computer or rollback to my previous driver or update my sound driver then sound comes.PLZ HELP
