I've just had the same problem. The problem is that windows doesn't install the HD AUDIO bus driver with the soundcard.
This is that I did:
I finally got it working!
It seems that this HD Audio bus driver has to be installed with the soundcard device.
Here's what I did.
1.Installed the KB888111da.exe
3. Went into the device manager, right clicked the soundcard (no name, just 'PCI-DEVICE'), updated the driver linking to C:\Drivers\Win\Audio\SMAXWDM\W2K_XP. Strangely enough, this doesn't install the audio driver, but it installs the HD audio bus driver instead.
5. Installed the SoundMAX audio drivers from IBM (C:\Drivers\Win\Audio\setup.exe)
So now I have sound! Very Happy
Thanks for your replies!