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make sure it says on the hp website that the driver you installed is compatible with XP. The drivers for Vista won't work on XP. As far as I can ascertain, all the drivers for that model on the PB international website are only for Vista, so you must have got lucky with the other drivers as XP seems to have installed them from it's own driver library on the XP CD. This is not unusual, but unfortunately the XP CD evidently doesn't contain a driver for your particualr video controller.
The one from PB is definitely only for Vista, as are it's other drivers, hence it doesn't work on XP.
You will either have to do a recovery back to Vista or make do without sound.
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