Then maybe it's Vista's fault. I'm not trying to be funny. I have seen a lot of people on here say that they reject Vista and use WinXP instead for gaming for various reasons. This could be one of them. Some dual-boot, some throw Vista out altogether. Either way, I've read a lot of comments how people just don't like Vista for some reason, and find XP to be superior as of right now.
Try downloading the older driver (5 Nov 07) on the Downloads
page at Creative. The one I linked to is just the Vista 64-bit drivers only for the XtremeMusic. I hope it works. If not, then it looks like the next step would be to contact them
. That's just their Contact Support page, which gives you a couple of options. One of them is that you get free e-mail support for the duration of the warranty.
Good luck bro. I hope this works out for you somehow, at least!