Help! HD Audio

So today I was using my ear piece connected to my speaker cause it had buzzing sounds when listening to music. Then.. i went to Sound and found 3 applications(?)
one was the nvidia hd something,another forgotten..and lastly the only one remaining is the "Speakers".. so now my audio sounds weird before i changed the settings.

Can anyone guide me how to restore back my default settings??

ps: in the sound,the set default button is disabled..:(
 

My Computer

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