I just investigated a Bluetooth issue that I traced back to the Bluetooth controller (which apparently connects internally via USB) not getting registered properly. It appeared in Device Manager with Code 43. I tried uninstalling it and rebooting, but that did nothing - the device just came back with the same error.
Some Googling turned up a Microsoft document that recommended not rebooting after uninstalling the device, but clicking Scan for hardware changes under the Action menu. Interestingly enough, that fixed the problem - Bluetooth devices immediately began working.
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