Welcome to FixYa,
You can install your Driver[Sound]Software from CD got when Purchasing of your PC.If you dont have Software /CD then you can Download it from here
[Select your Operating System and Enter a Code from Image properly,Click on Download-you Done] and Install it.
download it from HERE
the AGREEMENT at Bottom of Page after Clicked Download and Download will Start Soon]
Reboot your PC.Your Sound is Okey Now....I like to know feedback too.If this helped you-Rate Me..you can feel free contact...Thanks for Contacting FixYa..