On a mid-2011 iMac, how do I use Bluetooth on Windows 8? I installed Windows 8 over a Boot Camp installation of Windows 7 on my mid-2011 iMac. By and large it's worked perfectly, UX issues notwithstanding, apart from the rather critical part of a complete lack of Bluetooth. This means I can't use my Apple Wireless Keyboard. 

In Device Manager, I can't see any item that's related to Bluetooth, and in I'm not able to add any devices. I've tried re-installing the latest Boot Camp drivers, but I'm a bit lost at this point.

Any suggestions would be much appreciated.
Boot Camp is currently only meant for Windows 7, and the drivers are only meant for Windows 7. Maybe use Parallels or VirtualBox instead for Windows 8 for now.