This water mark keeps appearing on my screen randomly had the computer for around 3-4 years now. I had windows 10 and all that but now when I try to activate it runs into a error 0x80070002. On the Product key area only shows last 5 letters/digits. Ive done all the tricks Ive seen to get rid of the water mark but it comes back after a hour or if I launch a game. One moment I have windows 10 and next moment I dont and the product key is blank.