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From the Control Panel, click Hardware and Sound.
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Click the Adjust System Volume link under Sound to display the Volume Mixer dialog box.
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Make any of the following settings:
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Move the Device slider to adjust the system’s speaker volume up and down.
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For sounds played by Windows, such as a sound when you close an application (called system sounds), adjust the volume by moving the System Sounds slider.
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To mute either the main or application volume, click the speaker icon beneath either slider so that a red circle with a slash through indicating "no" appears.
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Click the Close button twice.
Here’s a handy shortcut for quickly adjusting the volume of your default sound device. Click the Volume button (which looks like a little gray speaker) in the notification area on the right side of the taskbar. To adjust the volume, use the slider on the Volume pop-up that appears, or click the Mute Speakers button to turn off sounds temporarily.
Today, many laptop keyboards include volume controls and a mute button to control sounds from your computer. Some even include buttons to play, pause, and stop audio playback. Having these buttons and other controls at your fingertips can be worth a little extra in the price of your keyboard.
If you’re using your laptop in a public place such as an Internet café and want to listen to music as you work, consider carrying a set of lightweight headphones with you and attach them to your laptop using the round headphone port. You can play your music or audio book as loud as you like and not disturb those around you.