An optional update for my USB bluetooth dongle (which I used to connect my Logitech bluetooth keyboard) recently appeared on one of my Windows 7 machines. Trustingly, I proceeded with the update, only to find that afterwards, my keyboard no longer worked! And there was no blueooth icon in the system tray to inspect the status of bluetooth devices. After googling, I found out that this update has killed many people’s bluetooth hardware and the solution is to uninstall it an go back to the default Windows drivers. The solution that worked for me (and others) detailed on this thread, which I will summarise (paste) here:
To accomplish this select “Update Driver Software” from “CSR BlueCore Nanosira” (the working device), then select “Browse my computer for driver software” and then “Let me pick form a list of device drivers on my computer”. In my case Windows presents the new driver from CSR (“CSR BlueCore Nanosira”) and two generic drivers as you can see in screenshot 2.
I selected “Generic Bluetooth Radio” from the list and clicked OK. Then I had “Generic Bluetooth Radio” and “Microsoft Bluetooth Enumerator” back under “Bluetooth Radios” and the Bluetooth icon appeard in the taskbar again. After that I was able to use my bluetooth mouse and keyboard again (even without pairing it again).
Thanks to davewebb8211!
Then you will want to hide that nasty windows update as follows: