First off, yes, you can use ANY USB mouse and keyboard to set up Windows after installing it. But as soon as possible after finishing the install, you should insert your Leopard install disc and let it install the Windows drivers for all your Mac hardware. I mean like "ok it's installed, now I do the drivers." Immediately, promptly, ASAP, etc. It is that important. Windows' installer has drivers for a broad range of hardware, and during the install it'll work fairly well. But once the installer is done, Windows itself will try to use the "best" driver, and what it uses if it can't find such a file is often a poor second.
So stick that Leopard disc in the drive while you're running Vista and let it find the right drivers for your hardware (Apple's installer app is pretty bright and will install the right drivers and only those drivers). Then your Apple wireless stuff should work fine.