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This issue may occur if the following conditions are true:
Because Windows XP Service Pack 2 support Bluetooth Device directly. If you plug the Bluetooth device without the driver, Windows XP Service Pack 2 will automatically install driver that is included in Windows XP SP2. If you install the driver form hardware after Windows detect Bluetooth device, it's control by Microsoft Bluetooth Enumerator, not the third-party driver.
To fix this issue and to successfully install the third-party driver for your Bluetooth adapter, use one of the methods that is described in the KB 840635.