Let's make sure you understand the background of what is going on here,
Windows and the MacOS are two different operating systems. Windows is written for many different hardware machines from 3rd party manufacturers and the Mac OS is written exclusively for their own hardware which they make. Apple wrote some drivers (Boot Camp) for Windows to use the Apple hardware as efficiently as possible. No more no less. Your hardware device's, sound, wireless, Bluetooth, etc, will always work while in the MacOS because it was made to. (well, in theory anyway's🙂)
Windows either has a minimum set of drivers or it will download a set for you in order to use the hardware or the manufacturer has to ship a driver with the device.
Apple use's similar hardware as the Windows machines so you can usually go to the manufacturer to download their drivers directly instead of using the Boot Camp drivers.
With all that said, installing ANY OS is a hit or miss some times. Windows has few more issues then the Apple OS because of the different hardware it's written for, not to mention the manufacturers are supposed to follow Microsoft's guide lines for compatibility.
Windows has a few problems for wireless and Bluetooth on dedicated Windows machines if you do a Yahoo/Google search so it's just a matter of finding the right fix.
It's not uncommon to have one problem after another with one install and just a simple reinstall of Windows (or Mac) and you can have a perfectly running machine. That's just the nature of the beast.
In your case if Windows doesn't see the hardware (Bluetooth card) then there isn't much you can do except what's been mentioned before for fixes.
When you trouble shoot Windows you always make sure it works on the Mac side as it's supposed to and if it does then it's a Windows problem or a driver issue.
You can boot into the Windows installer and "Repair Windows Installation" and see if that helps.
You can use one of the driver "UNinstaller" applications that completely deletes all information for that driver so you can start fresh that's been mentioned and reinstall the drivers and see what happens.
Or you can just reinstall Windows and see if it works. It has taken a few times for others and once for some.
Other issues that seems to be related to the W7 with SP1 installer disk/image is, Wireless, Bluetooth, and headphone/mic setups.