Nforce 2 and Klipsch

[Krux]

I have an XPC with an NFORCE 2 board well I?ve been using the 2.03 drivers for the longest time because newer ones reduced base considerably. well I decided after about a year or using them NVIDIA must have gotten there crap together so I went and got the 5.10's well now my center no longer works and neither do my rear speakers. I?ve run the stupid wizard 5 times or so is there some reason why (other then that NVIDIA sucks) when i listen to music now these 3 speakers don?t play anymore? I didn't pay 400+ dollars for these speakers to only hear 3 at a time. Anyways any help would be nice. Thanks.