Finding drivers for Macbook Pro (13 inch, i5, 2.3GHZ) without bootcamp
Get a Snow Leopard retail install disk. Fix the partitions and erase and install Snow Leopard. Download and install the latest SL combo update, or continue on the the usual upgrade path to Lion and/or Mountain Lion according to the customer's preference and the capabilities of the Mac.

Download and install VirtualBox. Make a new Windows VM and re-install Windows. Note that Bootcamp doesn't yet support Windows 8.