Bootcamp Mavericks Windows 8.1 Bluetooth FIX!!!
I finally figured out how to get my computer to recognize the bluetooth driver in Windows 8 and 8.1!!! For some reason the MotionInJoy driver I installed a while ago made the Bluetooth driver disappear. What you want to do is go to Device Manager (Settings/Control Panel/Device Manager). At the very bottom your extra game driver should be for MotionInJoy. I simply uninstalled it, waited 1 min and re-opened the device manager. Then the Bluetooth driver was there and I could pair my keyboard again!!! I'm currently writing from it 🙂
iMac (21.5-inch, Late 2012), OS X Mavericks (10.9), Bluetooth Bootcamp Windows 8