Copied from Realtek Homepage:

Driver Package R2.15

Realtek HD Audio Driver support all of Realtek HD Audio Codec in Windows Vista.

Vista WHQL Supporting: 
ALC882, ALC883, ALC885, ALC888, ALC889, ALC861VD, ALC660, ALC662, ALC663, ALC665, ALC260, ALC262,ALC267, ALC268, ALC269, ALC272, ALC273, ALC887

HDMI Device WHQL Support: ATI HDMI Devices

OS Supporting: Microsoft Windows Vista x86/x64

Pack with Microsoft High Definition Audio UAAV1.0a(5013)


Driver version:

Windows Vista: 6.0.1.5783



Driver Installation/Removal Procedure For Realtek High Definition Audio Codec:
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Setup Driver at first time:
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Windows Vista :
Step 1. Run the setup.exe program to start the installation. 
  
Step 2. Click on [Next/OK/Go] to continue the procedure. If the Windows popup 
        "Windows can't verify the publisher of this driver software" message, 
        press "Install this driver software anyway" to continue the installation.
        
Step 3. Finally, select to restart the system and press [Finish] to complete
        the installation.

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Update Driver:
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Windows Vista :
Step 1. Run setup.exe, it will remove the original driver in your system.

Step 2. Click "Next" to remove the original audio driver in your system.

Step 3. Once after the original driver removed , reboot the computer.

Step 4. Please go back to the new driver package after computer restarted.

Step 5. Run setup.exe, it will install the new audio driver then.

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Remove Driver:
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Windows Vista :
Step 1. Go to StartSettingsControl Panel.

Step 2. Select [Programs] icon.

Step 3. Select [Programs and Features] icon.

Step 4. Select "Realtek HD Audio Drivers" and press [uninstall] button.

Step 5. Click on [Next/OK/Go] to finish the uninstallation.        

Step 6. At the end of the procedure, select to restart the system and press
        [Finish] to complete the uninstallation.


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Silent Installation:
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Run "Setup.exe /s /f2 /z[-rp]"
i.e. setup.exe /s /f2c:mylog.log /z[-rpC:RHDSetup.log]

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Silent Uninstallation:
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Run "Setup.exe /removeonly /s /f1 /f2 /z[-rp]"
i.e. setup.exe /removeonly /s /f1C:AudioDriverUSetup.iss /f2c:mylog.log /z[-rpC:RHDSetup.log]


Note: 1. Please update Directx version to DirectX8.1 or above.



Changelog:

Add/Fix

1.) Driver :

Customizations.

Change Creative components for the certain customers.


2.) Package :

Change Japanese language on finish Dialog of installation.

Fix DCC uninstalled issue. Both MSI and GUID uninstallation procedure supported.

Fix uninstall problem in Windows 7. The DIFxAPI DLL file supported in Windows 7.