@Rocketman83:
Yes, that was the folder I meant, but I probably made a mistake when I said the general Boot Camp installer was there. I think the installer you want (not for installing Windows 7, mind you; just for installing the 64-bit drivers for Apple hardware in Windows) is BootCamp64.msi. I think (remember this was done years ago) I simply right-clicked the file and chose to run it with administrative privileges; I don't recall needing to explicitly invoke msiexec /i myself. If you have a problem in that area, it may be due to the fact your Windows\System32 folder isn't in your PATH. Short of modifying the PATH definition, I suppose you can enter something like "C:\Windows\System32\msiexec /i BootCamp64.msi", supposing you run this command from the folder where BootCamp64.msi is located.
In any case, before you run that, you need to install the 64-bit version of Windows 7 Ultimate. To do that, naturally, you need the Windows DVD installer. Once the installation is finished, you'll have a basic Windows 7 system, but probably with no sound, no iSight, no network, etcetera. After you install BootCamp64.msi, you'll have all those goodies.