I've been getting truck loads of e-mail on which drivers I'm using with my Audigy 2 ZS on Windows 7. To try and stem the tide here's the quick findings:
1) The Audigy 2 ZS drivers that Windows installs from Windows Update for both 32-bit and 64-bit occasionally produce garbled audio. These are dated 2006 and are probably identical to the original Windows Vista release.
2) Newer drivers resolve this, or at least it hasn't happened in the last week I've been using these drivers. I've been using the modified 'Danial_K' drivers on both Vista and 7. They fix the garbled audio issue on Windows 7. Creative’s own newer Vista release may fix it, but I haven't tested them.
3) They do have some problems however, CMSS doesn't work, and some of the Creative apps don't work on 64-bit.
4) Updated: Download the updated drivers from here.
For X-Fi people, I know the drivers from Creative's website will install if you run them in compatibility mode as they do a version check off the bat which would fail.
Due to the volume of e-mail I'm getting on this issue I won't be able to respond to all of them, don't take it personally.