Sound problem in my laptop

Hi i am not able to hear any sound from my aspire 4520 laptop. i tried everything from reinstalling the driver ... still i cant hear any sound. when i go to the sound and audio devices it shows bluetooth hand;s free audio as the default device. how can i remove this . i tried uninstalling blueetooth hands free from control panel system device manger... but after i restart my computer it still says found new hardware device bluetooth hands free audio device.. please help me...