If the problem occurs in both systems we can not think that the error is in the software but in the hardware.
The network card is not working properly.
I, if applicable, would exercise the guarantee on the seller and in addition, if paid by PayPal, would open a dispute because the equipment does not meet expectations, not working the Wifi. This guarantees a refund or a change of equipment.
Sometimes the stores offer a partial refund so that, with that money, make a repair in your place of residence.
I regret that you have had this problem and you are inconvenienced but understand that a malfunction is possible in an electronic equipment.