1. Click 'Start' and 'Control Panel.'
2. Click 'Hardware and Sound' and click 'Device Manager.'

3. Click 'Continue' when prompted for administrative permission to perform the action. If you are unable to perform the action due to lack of permission, log off the computer and log on as the administrator or as a user that has administrative privileges.
4. Click the 'Plus' sign (' ') next to the 'Sound, Video and Game Controllers' line in 'Device Manager.'
5. Double-click the device that has an exclamation point or question mark next to it, which indicates a problem with the hardware device driver, to launch the audio device properties dialog box. If there are no such devices located in the sound, video and game controllers section, look for an 'Unknown Device' located elsewhere and double-click on it.
6. Click 'Update Driver' from the 'Driver' tab of the audio device properties dialog box.
7. Click 'Search Automatically for Updated Driver Software.' Follow the prompts to install the updated driver. If a driver is not found, launch a Web browser and navigate to the computer, motherboard or sound card manufacturer's website to locate the updated hardware device drivers and download them, following the specific instructions included with the driver being downloaded.