So basically I bought a HP desktop computer a few years ago. It came pre-installed with a copy of windows 7 on it. Since buying it I have literally changed everything on it so the only thing that is in there at the moment from the original computer is the hard drive. Now I sold it a while ago and the guy who I sold it to is telling me when he logs in, the desktop background is black and in the bottom right hand corner it says "this copy of windows 7 is illegal". Now I have had this problem before but I have no idea how I fixed it before. I no longer have the original CD key or nothing because that was on the old case in sticker form which I no longer have. Any help would be much appreciated.
Many thanks, Connor.
Many thanks, Connor.