I absolutely love the apple mini aluminium keyboards, they're the best thing ever!
But, they take a bit of effort to get working on windows 7.
From the Snow Leapard disk, or from torrents (more reliably working for me!) You need the Bootcamp drivers, from the directory "BootCamp/drivers/apple copy the BootCamp64.msi to the desktop, along with BootCamp/drivers/apple/64/AppleKeyboard64Installer.exe
Also, download the 3.1, 3.2, and 3.3 update files from Apple (easily found)
Get an administrator privileged CMD window up, run BootCamp64.msi from it.
It'll give errors, just click Ok. Don't reboot.
Install the updates in order, then reboot.
Welcome to a fully working apple keyboard in windows that's not on a mac :)