You are not using the proper driver... all HD sound chips require the installation of the Microsoft UAA driver prior to installing the regular sound driver. This file contains both, just save the file to your desktop, then double-click it to start the installation. Follow on-screen prompts until finished.
Realtek Function driver Realtek Function driver for Realtek Azalia audio chip (Including Microsoft UAA Driver in English edition)
File date: 2010/06/08
File size: 67.56 MB
OS Supported: Windows XP
File name: motherboard_driver_audio_realtek_azalia.exe
For Gigabyte GA-M61SME-S2 (rev. 2.x)
Motherboard (Sound Driver)
Note: Before installing this driver, be sure to uninstall all sound devices in Device Manager.