I have the same card on a win 7 setup.. works fine..
I used these drivers below..
Mine is moded with lm4652 opamps, and the muting transistors removed..
Without those mods the card doesn't sound very good at all... it's only slightly better than modern onboard sound, with a slightly better noise floor..
the only creative card that "sounds good" out of the box is the "titanium HD".. because it was designed from the grounds up with fidelity in mind...
If you look at the 2 zs, the base xfi, they all use regular caps where bipolar caps are required..
and instead of using say prop-film caps, they used can-caps to reduce cost...
http://support.creative.com/downloads/download.aspx?nDownloadId=11314