5 1 sound realtek acl655 board sound

5.1 sound problem with Realtek ACL655 on board sound

I have managed to get sound but it only comes through the front speakers and my centre speaker. The sub woofer and rear speakers don't produce anything and rear speakers (or side speakers according to the setup) come out the front speakers.
Does anyone know how to solve this problem?
I have tried the vista beta 1 and 2 drivers and I've tried the drivers supplied with my motherboard.

Windows Vista

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