speaker problems

ive got a sound card that supports up to 7.1 speakers, and im currently running 5.1, so it should be fine. the problem is is that when i alligned all the colored wires into my subwoofer and my sound card, sound only comes from one speaker, the front left one. i've checked all my speakers and they all are in their right places (talking about the wires), so i really don't know what to say. any ideas?

Have you enabled 5.1 from within the cards control panel?

Go into START > All Programs > Creative > Creative Speaker Settings and select 5.1 from the drop down box.