I don't think the Audigy 2 (in PCI slot) works in Windows 7, at least not x64.
A year ago when I first installed Windows 7 Pro x64 I had planned to use my Creative Audigy 2 card (PCI) in my new ASUS P5Q3 board. First, I disabled the "high definition audio" in the BIOS of the board (for the onboard Realtek sound chip). But like you I was unable to get the Creative Audigy 2 card to either get recognized by the Windows 7 installer or have the driver
Fortunately, I had a Creative X-Fi Titanium (PCI-e x1) sound card in my other machine which was still running WinXP Pro x32, and which I really didn't care about. I'd actually planned to use the optical digital audio connector on that X-Fi card but never really made use of it. Turns out it was for "output only" and not for "input" as I thought.
That other machine had a SuperMicro C2SBX board in it, which also had Realtek onboard sound. So I removed the Create X-Fi card from the PCI-e slot, enabled the Realtek onboard sound, installed the Realtek HD Audio Codec driver on that machine, and was off and running (still under WinXP Pro x86).
Then I removed the Audigy 2 (PCI) card from the ASUS P5Q3 machine I was getting going with Windows 7 Pro x64, installed the X-Fi (PCI-e x1) card, and once again installed Windows 7 x64 from scratch.
Bingo, presto! Card recognized perfectly by Windows 7, and up-to-date driver software obtained from Creative's sight.
I think you may just have to give up on that legacy Audigy 2 card in your Windows 7 x64 machine. Go with an X-Fi Titanium (or other variant). They're not expensive and you won't be disappointed.