Hi,
You should have the sound driver for your PC in the driver disc.The drive Disc resides in the Box of the system. I don't have had the exact problem.If you don't have the Disc or a copy of the driver then you have to download itfrom website. So for your requirement visit http://www8.hp.com/in/en/support-drivers.html, then enter your product number and search the driver. You can download the driver from here and itis totally free of cost.
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