Geez, if you need any further details let us know. I keep monitoring this thread about our issue. I am afraid it has something to do with the sound card capabilities, i think even with the lowest sample rate the game cannot handle it unless it has something to do with the driver privileges within the game.

I have the exact same issue, and same sound card (Creative Sound BlasterX G6). If i change the quality of the microphone within the card it will work for a few minutes and then it will stop working again.