Click Start, click Control Panel, double-click System, click the Hardware tab, and then click Device Manager. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
Double-click Sound, video and game controllers
to expand that category. If a sound card is listed, you have one
installed. If no sound card is listed, check the information that came
with your computer to see if there's supposed to be a sound card
installed. If there should be a sound card installed, you'll need to
install one.If you think you have a sound card installed, but you don't see it under the Sound, video and game controllers category, expand the Other devices category and check any devices listed there.Laptops don't usually have sound cards.
Instead, they have integrated sound processors, which appear in the same
category in Device Manager.
If there's a yellow question mark next to the name of the sound card in Device Manager, there might be a problem. Right-click the name of the sound card, and then click Properties. Click the General tab, and then look in the Device status box to identify problems with the sound card. Although most speakers have a volume control, you can control the overall level of sound using Windows.
Open Volume Control by clicking the Start button , clicking Control Panel, clicking Hardware and Sound, and then, under Audio Devices and Sound, clicking Adjust system volume.
Under Main Volume, move the slider up or down to raise or lower the volume.
The sound drivers might not be installed
if your computer came with
a motherboard disc the sound drivers could be on it
click start control panel
administrive tools computer management device manager scroll to sound,video and
game controllers you might see a yellow question mark? Right click to reinstall
drivers or you can download the drivers
http://download.cnet.com/Realtek-AC-97-Driver-Windows-98-Me-2000-XP-2003/3000-2120_4-10238712.html
Realtek AC
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