Hey ive noticed a message that is like permanently in the bottom corner of my screen, it says i need to Activate Windows and when i go into settings it says i have not activated windows and i am running a unverified version or something, it also says to enter a key or buy a real copy??? i bought this pc with windows 10 like 3 years ago please help, PS my windows key is long gone as i have a new case and lost the sticker