Live! 24-bit - disabling onboard AC3 decod

I have read that in order to hook up my computer to my home theater 5. system (a receiver that decodes AC3), I need two things: a mono minijack-RCA (coaxial) adapter, and to disable the onboard decoder.
I have the adapter, and the drivers installed from the packaged disc (there are none available from the website that I could find), but I cannot find where to disable the onboard decoder, so I am only getting 2. through my receiver.
The I/O module seems to provide the same solution as the adapter - optical and coaxial connections directly, but does it then encode the signal again or somehow disable it on the card?
I previously had the Li've! Platinum with the Li'veDri've bay, but even when connecting the coaxial connection from there to the receiver, I was still only getting 2.. I also could not disable the onboard decoder on that card either - the Decoder tab or whatever from the AudioHQ program was not there.
I upgraded to the Li've 24-bit in hope that this would be easier.

Jeremy,
You are right. The DVD I was using to test did not have much rear sound - but I also selected Use SPDIF output in PowerDVD and maybe that helped. I am now getting true 5. from DVDs.
However, it seems to be only 3. (left, right, center, sub) in games, for example in Half Life 2's sound test, even though the speakers setting is set to 5.. And the Creative Speaker Setting application's channel and noise test only plays in the left and right.
Music files come through in simulated 5..
Any ideas how to get 5. in games?
Derek

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