I bought a used computer that apparently was loaded with Win Xp (volume license). It will not validate as an authentic copy of windows and causes an annoying pop up window to interrupt everything I do. To remedy this situation I foolishly thought buying an authentic copy of win xp home addition would be the answer. I put in the new disk and it says that I cannot upgrade. It sounds like I will have to wipe my computer just to change the OEM to this one. I would really hate to do that. Someone please tell me that I can just install this new one without deleting all the files on my computer and reinstalling. I paid microsoft the money why should I still be punished?