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I've downloaded and installed driver version 6.0.1.7500 and activated the VIA HD Audio Deck
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From where? I do not recommend using the drivers from VIA as those are basically generic drivers. Motherboard makers often customize drivers for that specific board. Therefore, you should always get the latest drivers for integrated motherboard devices from the motherboard maker's website.
Any errors in Device Manager?
Also there is a bug somewhere because on a couple Win7 systems, in order to get 5.1 audio, we had to select 7.1, then disable the unused channels in order to get the back speakers to work. Very strange, but it worked.