I have a copy of Windows XP upgrade. I was not the one who bought it, a friend did. He used it on his machine. I have 2 PCs at home. I used the same copy to upgrade one of my OS. Now recently, I had to reformat my second PC and needed to install an OS. So I still had the copy laying around and decided to install it. It works fine, the only thing is that I am reminded to activate Windows XP. There is a reminder that pops up each time I boot up. I had 30 days from the install date, now I’m down to 19. When I try to go an activate it, it tells me that my CD key has been used too many times and they wont allow me to activate it. Anyone know what will happen if I don’t activate it? My only option at this point is to buy ANOTHER Win XP copy and use the new CD key. Everything is legit with the first one I used. Thanks for any input!