5 1 sound s realtek alc655 board sound

5.1 sound problems on Realtek ALC655 on board sound.

I have managed to get sound from the front speakers and the centre speaker but the rear speakers and sub woofer won't work at all.
I've
tried the beta 1 and beta 2 vista driver from realtek and they don't solve the problem.
Does anyone know if there is another solution or drivers that I should use instead?

Windows Vista

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