no sound in vista on mac mini with bootcamp 1.3

I have vista installed on a mac mini with bootcamp 1.3.
I have no sound and the audio icon on the desktop has a red cross. Everything seems to be fine in device manager. I have tried to installed the last realtek driver but it didn´t work., I have also tried to reinstall the sigmatel high def audio driver but no help.
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williamceAuthor Commented:
Ok I've fixed it.
I found a realtek ac 97 driver and installed it,  then i removed the sigmatel driver, remove the webcam  and restarted the mac mini.
After restart, the desktop icon was ok but no sound, i ran the bootcamp drivers setup again and chose repair then i restarted again and it's was ok.

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