Boot camp audio

Ok windows is running smoothly, except I don't have any audio. There was an error when I installed my Mac Drivers, and i cannot get any sound. I don't know what the error was, but the installation had seemed to be uncompleted. I tried reinstalling the mac drivers and the same problem happened. Does anyone have any ideas how i can get sound??
MBP   Mac OS X (10.4.6)  

Hi,
I'm very frustrated about this "No sound issue". Since i've updadated to Bootcamp v1.1 i've this Problem in Windows XP no Sound. Tried to reinstall Windows and tried to use the OLD Sigmatel Driver Version from Bootcamp v1.0
But it doesn't work. I'm depending on audio/soundcard because i've very low vision and i'm using a screenreader.
In OS X Tiger it works perfectly. But no sound in Windows XP.
When i'm installing these Sigmatel Drivers from the Bootcamp Drivers CD, the Sound is working, but after a reboot it's gone and the Sigmatel Device in the Control Panel is gone too.
Tried other Sigmatel Driver Versions with no results, always the same Problem, but i've created a small workaround:
1. After a clean Windows XP Installation, install the Sigmatel Drivers and DON'T reboot your system
2. Download
http://support.microsoft.com/?kbid=311272
this small utility from Microsoft. Extract it and copy the EXE file to Windows System32 Directory
3. Create a small batch file with this content:
devcon disable 27D8
Save it as disable.cmd and execute it.
4. Create a second small batch file with this content:
devcon enable 27D8
Save it as enable.cmd
5. After the next Windows Startup, execute the enable.cmd
Now the sound is working, i guess this is a problem with the Microsoft UAA Bus Driver for High Definition Audio.
Don't forget to execute the disable.cmd before Shutdown your System!!!
It's a nice workaround and it's very helpful for me, but not very long, when i'm installing the ATI Drivers for my Videocard, the Sound is totally gone. With my workaround sound is only working when you don't install the ATI Drivers. I hope there's a patch available as soon as possible.
Greetings from germany
Steve

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