When doing a Windows Update it’s possible Bluetooth sometimes stops working. If you go to Device Manager you will see the Bluetooth icon with or without devices.
Windows sometimes removes hardware drivers or replaces them with ones that don’t work. To fix this go to Device Manager and click on the Bluetooth icon. If there are items, right click them and select ‘Update driver’. Click on ‘Search automatically for drivers’. If it doesn’t find anything, select ‘Search for updated drivers on Windows Update’.
If no Bluetooth items are showing, right click the computer name at the top and use ‘Scan for hardware changes’. If it still doesn’t work go to the web site support for your desktop/laptop manufacturer and look for and download the Bluetooth drivers.