How to reduce the noise in audio system

Hi!
I am S.Chaithanya Swaroop,& I am using a hp laptop
the model details are
model number: HAPPY 400tx notebook
product number:LN357PA#ACJ
          I am using windows -7 ultimate os(32 bit) in my notebook. now i am getting noise in my audio system.
please provide me the solution to my problem.

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