Vista sound problem!

I just installed a clean install of vista, and I noticed that I only get 2.1 sound. I have a TerraTec 5.1 FUN PCI sound card, which I installed the drivers for. I connect my speaker system to the soundcard using three 3.5mm jacks. When I play a test sound, all the speakers makes a sound, but elsewhere I only get 2.1 sound! Anyone know how to solve this problem?

Heres a picture of my settings http://img244.imageshack.us/img244/3540/aureon.jpg

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