I think its down to the fact that it instals the same drivers for both. So gets massive conflicts when u try and use 2 of the same cards at the same time, as its tryin to do 2 things using one driver. Does that make sense?

So i am not sure how u could fix this problem, coz it is just a conflict that u will get.

The only sollution which i cna think of is using another soundcard of a different make, so u wouldnt get the driver conflicts.

Or contact creative and ask them if u cna run 2 in parallel, they have a very helpful online customer service section. Helped me a lot with my mp3 player.

So i would send them an email and ask. They should reply within a few working days

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