Hello all, I have an hp laptop with windows 8 installed. I would like to reinstall it to sell the laptop. Like many OEM laptops it has a windows 8 sticker with a product key on the bottom. Since that key is currently in use in the laptop right now and it's an OEM copy of windows will I be able to put in that key and have windows be activated after I reinstall? Or will it say that the key is invalid or already in use? If it won't work then how can I make that key on the bottom work? Thanks for any help you guys can give!