You might need to go to go back to the Manufacturer's site of your laptop and download the latest chipset drivers.
If the Wi-Fi Adapter is not showing up in your Device Manager, it can be a hdwe issue, perhaps bad port on the Motherboard.
Have you also toggled on the FN keys on your keyboard, FN+F2 or FN+F9 to activate the wireless key?
Also, Check for any physical switch on your laptop.
If none of the above suggestions worked, you may always consider buying a Wi-Fi Adapter.