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Recently my Windows 7 64-bit has found an unknown device in the category of USB controllers. It was not able to find any driver neither on my computer, nor on Windows Update servers. At the same time Bluetooth support and device disappeared.

Simple logic suggests that somehow Windows has lost information about Bluetooth driver and now recognizes it as unknown USB device. Moreover, afaik my internal Bluetooth is connected through USB interface to the main board.

Any suggestions? What should I do to diagnose the problem? How do I fix my Bluetooth w/o reinstalling Windows?

Hardware: MacBook Pro 15" (6.2, mid 2010).

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Have you tried reinstalling the drivers offered by your Bluetooth adapter's manufacturer? Have you tried a System Restore back to a point before this happened, to see if it works as expected? – techie007 Nov 23 '11 at 20:18
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Does the MAC still have OSX installed? Does bluetooth work in OSX if so? – Paul Nov 23 '11 at 22:47
@Paul Thanks. Actually after I rebooted into Ubuntu and OSX and checked my device it worked there. After another reboot back to Windows it started to work in it as well. Apparently that was some kind of firmware issue and either OS X or Ubuntu reset Bluetooth device into a working state. – Sergiy Byelozyorov Nov 23 '11 at 23:43
@techie007 I have installed drivers with Boot Camp. No, I have not tried reinstalling them. Also I have not tried to use System Restore. If I will experience such problem I will try your advice before rebooting into OSX to see if this would have any effect. – Sergiy Byelozyorov Nov 23 '11 at 23:46
@Paul You can add your advice as an answer and I will mark it as such. – Sergiy Byelozyorov Nov 23 '11 at 23:49
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Go to the unknown device in 

Device Manager, Properties / Details and select Hardware IDs from the dropdown

You should see a four hex digit vid and pid. If you do a search in google for these, and it shows up as your bluetooth device, then you know the unknown is the bluetooth device, and it is a case of finding and re-installing the drivers.

If the unknown device isn't your bluetooth device, then the likely answer is that the bluetooth device is broken, as it is not being detected properly.

If you confirm bluetooth is working in OSX, then we know the bluetooth module is fine, so it remains a Windows issue with drivers/firmware.

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Hardware ID for the unknown device contains USB/UNKNOWN. Bluetooth device is not broken as it works both in MacOS X and in Ubuntu on the same machine. I am not sure though that this device is my Bluetooth, it just looked suspiciously that new device appeared same day that my Bluetooth disappeared. – Sergiy Byelozyorov Nov 23 '11 at 23:42
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