BootCamp 4.0 supports Windows 7 x86 32bit and although not officially supported will probably work with Windows 8 x86 32bit as well with some effort to locate missing drivers.
Check here to see which Bootcamp works with your specific Macintosh Model.
and here to find the BootCamp 4.0 Drivers you need to install in Windows for your specific Macintosh Model.
