The latest download of Realtek's HD audio driver version available for Windows XP and Vista, it supposedly runs under Windows 7 too.
The HD audio driver version for Realtek chips is available for download on our server. This download offers both the Windows XP and Vista binaries, the files contain drivers for the 32 Bit and 64 Bit versions. All Realtek HD audio chips, which are common on many motherboards and in notebooks, are supported.
You can download it here.