Is is a "brand-name" computer, such as a DELL?
If so, access:
http://www.DELL.com and click "support".
Enter the model-number, and do a search for "device-drivers".
Pick the device-driver for your Operating System, download & install it.
Or, does your computer have an add-on PCI soundcard,
such as one from Creative Labs?
If so, access
http://www.SoundBlaster.com
and find the device-driver for that hardware.
Or, within "Device Manager", double-click the sound-device,
and click "reinstall driver", and allow Windows to connect to the Internet
to find/download a driver.
Or, access
http://WindowsUpdate.microsoft.com
and click on 'Custom', and then click on 'Optional Hardware',
to see if Windows Update can find a device-driver.
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