If it does, reinstall the driver software for the Bluetooth adapter. Click 'Start | Computer | System Properties | Device Manager,' then locate the Bluetooth receiver adapter in the list of hardware devices and ensure that the adapter does not have a yellow or red icon next to it.
However, if Vista does not recognize the device after a few seconds, first ensure that your computer has a Bluetooth receiver adapter and that it is active. Most of the time, you should be able to start using a Bluetooth device with Windows Vista within a few seconds of enabling it or turning it on.
