If you already have a good xp key don't buy another one, Like eric said borrow someone's cd, even make a copy for yourself there is no copy protection on an xp cd. WHY?? its the key that is important not the cd. the company might have went under but Microsoft hasn't. The worst that can happen is you have to call micrsoft when you go to re-activate. Dude this is perfectly legal. The newer the cd the better chance your cd key will work. Microsoft has enough money you don't need to give them more when you already paid for it.