First of all check if the driver are still installed, but hidden and of that so, try to Uninstall them and let the System reinstall them automatically:
1. Press WINDOWS + X
2. Click on "Device Manager"
3. Click on "View"
4. Click on "Show hidden device"
5. Click on "Bluetooth"
6. Right click on your bluetooth device
7. Click on "Uninstall device"
8. Click on "Detecrts Hardware change" (monitor icon)
