It must be something to do with the setup, as i have Vista 64, i have borrowed a Creative X-Fi Gamer Extreme for the evening. So am ready to help.
Can you post a picture of what cables you are using and what they are connecting to, amplifier, home theatre?
It won't be the drivers it will be the setup, like its outputting a 7.1 and you don't have it or its set to digital 5.1 and you don't have it, it will be something like that.
So if you can post a pic of what you are connecting it to and how, maybe we can finally sort this out.