Intel D425KT Desktop Board Onboard Audio Device Not Working

Hi Team,

I have installed Windows 7 Ultimate in my desktop. Its having a D425KT motherboard. Onboard audio is enabled in bios. Still its not being detected by the OS. I have installed the below driver files. Also I have tried using the Intel Driver Update Utility Installer. Still no luck.

1. INF_allOS_9.2.0.1030
2. LAN_allWin7_7.017_PV_RTL
3. GFX_Win7_32_15.12.75.50.7.2230_PV_Intel
4. AUD_allOS_11.50.0.43969_PV

below is the output of the board id tool.

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Below is the device manager screen.

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Appreciate your help on resolving this.