Sound System Not Worked on My PC

I do;t have technical knowledge. Last night my younger brother was used my laptop and change some sound setting can anyone tell me how can i change default to my sound setting running windows 7 professional version
simons11Asked:
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Ankit PareekOnline MarketingCommented:
Hey you can choose setting default by following these steps

See the sound icon on your task bar right side
right click on it
Choose sound option
In sound tab choose windows default
Apply and OK

Now you are again as your default sound settings
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Michael-BestCommented:
Click on the Windows Start button and choose Control Panel.
Choose Sound.
Click Set Default

Some pc-optimization options you may be interested in reading:
http://www.sweetwater.com/sweetcare/articles/pc-optimization-guide-for-windows-7/
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