What are the setting for realtek audio drivers on windowsXP for 2 1 speakers

Hello,
i plug my 2.1 speaker and the pc doesnt by pass *** it acts like i still only have two speakers plugged in the subwoofer and one speaker works and the sub doesnt sound like a subwoofer it sounds like a regular speaker.. I go to configuration and see that its on stereo when i test it tests two speakers the subwoofer and the left speaker and the right plays no sound its like the right speaker is non existant everyone says leave it on stereo and your computer will send the low frequency sounds to the sub but its lies vista is treating it like its still just two speakers..