swapping mobo intel amd

So I decided to upgrade from a r5 2600x to an I7 8700k I understand that with you a big hardware switch you should re install windows and in most cases back all your data up, but installed to my friend who switched from intel to ryzen and he didn’t have to do anything to his pc it booted right...

laptop running windows 7 won't connect with network security key ,says "the key is incorrect" but other computers are using the same key to access the network,also the laptop worked at another wifi location.