Does anything work? Assuming the nVidia hardware has a 64 bit Vista driver, that should work fine. As for th Apple-specific hardware, you may be stuck.
What was the purpose in getting the 64 bit version to begin with? If you have particular software that MUST run on 64 bit Vista, you may have more problems than just lacking a wireless networking driver... Is Vista 64 actually workable for gaming? You do realize that, even with a "64 bit CPU architecture", that 32 bit Vista will work, don't you?