Easier Way
Thanks to your help, I figured out a much easier way to get bluetooth working and you don't even need a single dongle. First, go to the terminal and type:
sudo kextunload -b com.apple.driver.AppleUSBBluetoothHCIController
You will need the root password for your computer to do this. If you have not setup a root password, you will need to set this up. You may have to google to figure out how to setup a root / superuser account for OSX.
If you want to use a dongle, it maybe using a different driver, so try:
sudo kextunload -b com.apple.driver.CSRUSBBluetoothHCIController
If you do a kextstat, it will display all loaded kernel extensions. You can use this
'sudo kextunload -b [bundle name] to temporarily remove all bluetooth related kernel extensions currently in use.
One you have unloaded these extensions, you will then be able to connect them as usb devices in windows on parallels. These instructions assume that either you don't have a dongle, or you want to use the dongle in windows instead of the built in bluetooth in windows. These directions will temporarily disable bluetooth functionality in OSX. On the other hand, if you have a dongle, and you don't mind using the built-in bluetooth on your computer in Windows, simply plug in your dongle and OSX will free up the built-in bluetooth adapter for use in windows. As far as I can tell, sp2 seems to automatically install the drivers. If this doesn't work for you, try the bootcamp drivers.