How to get bluetooth USB host controller for Mac.

I'm using 20" Aluminum iMac and I have the problem with installing bluetooth usb host controller for mac while Leopard running with XP on Fusion. I plugged in the dongle to usb to get it through built-in iMac bluetooth, XP found it, but couldn’t install because no drivers were found. I am planning to buy the Leopard DVD to get Boot Camp drivers from it as I have heard it is the solution. However, are there any other ways to get my Bluetooth working with XP under Fusion?
