To install audio devices in Windows, first troubleshoot the exact problem using Device Manager Utility. Usually, the audio driver is incompatible, uninstalled, incompletely installed or corrupted.
In case the audio device is present and is enabled, try disabling it then re-enabling it. If this does not work, try uninstalling the device then restart your computer. Windows will then detect your device and re-install it.
If you are still unable to get the sound card to work, download the audio driver for your sound card from the manufacturer’s website manually. Alternatively, try using a driver finder program (such as Driver Downloader) to locate the right audio driver for your sound card. This will avoid driver compatibility issues. Install the driver after the download is complete. You may also install from driver disc. Reboot your computer, then test for sound.
Make sure the right audio device is listed as the default audio device. Also, be sure to set the speaker volume high enough to hear. Most computers use Realtek Audio Codec or Creative Audigy software. Finally, if all the above recommendations do not resolve your issue, it is likely that the sound card is not working and defective: Contact professionals for assistance.