Funny that, I have an old Dell and that stopped seeing the WiFi (not the adapter though) yesterday. After wasting a few hours trying a lot of things I rolled it back to an image from a few weeks ago and it worked. I suspect a Windows update broke it. I'm just re-applying the update as we speak so will know later whether it is OK.
You can buy a USB WiFi adapter for a few quid which might work. Cheap - not great for gaming but adequate for most use. Like this www.ebay.co.uk/itm/303847059930?hash=item46beb231da%3Ag%3ANw0AAOSwQrJepCjo&LH_BIN=1
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