I believe all indications are that this PCI card is not supported by Creative under Windows 7.
Anything you can manage to get to work by virtue of using Vista drivers
(if they were available), or Windows 7 drivers for another card that just happens to also work for this one... well, there's really no guarantee you're going to be satisfied with the result.
I had an Audigy/2 card (also PCI) I wanted to used in my Windows 7 system because I'd really grown to like its sound over the many years I used it in a number of WinXP systems. Well, it was just unsupported in Windows 7.
Now I had built myself a brand new machines, which had both PCI and PCI-e slots on the ASUS P5Q3 motherboard. It also had onboard Realtek ALC1200 sound as well that I could have used. So I had a few options.
Well, when the Audigy/2 would not install I tried the Realtek chip to see if I'd accept it, but honestly was not satisfied with the sound.
I finally decided to buy a basic but competent Creative X-Fi Titanium (SB0880) PCI-e card which had good reviews, and which of course IS supported by Creative under Windows 7. And when I got it installed it also sounded great to me.
So that's what I'm using in that machine ever since going to Windows 7, an X-Fi Titanium PCI-e card.
So, maybe it's just time to look for another sound solution for your environment, which will work with your hardware but also IS supported by Windows 7 and Creative.