My 89 yr old mother-in-law bought a desktop from an estate sale. Said she was told it had a 'pirated' copy of XP on it. Called me to find out what that was. She only wanted the computer to do e-mail and FaceBook with the grandkids and great-grandkids. Said she only paid $20 and wanted to know if I could "fix" it. Now, I do have a legal copy of XP that was on a computer that has long since bit the dust. The XP program was an upgrade from ME. I would like to help her and wonder if I could take my upgrade legal CD of XP and just put it in the machine and copy over the 'pirated' copy?