go to accessories-system tools-system information 
and learn what sound card you have by name 
 
have your serial and model numbers handy for 
putting them into a site if needed and re download the driver 
 
basically the driver went south 
 
the other thing to do is to restart  
your PC hitting the F8 key repeatedly 
until you reach the "last known good configuration" screen 
and select it 
		
		
		
		
		
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