I have some CDs which I think can be used to install Windows ME on my system - however, they're not official Microsoft CDs as the computer came with ME but without any discs to install it from so we had to send away for some replacement ones and got five CDs. I have no idea what they all do, there are no instructions. I don't know if I'd want to risk putting ME back on to my system and then using the upgrade to install XP, do you think this could work? It would be cheaper (c'mon, I'm only 17, I can't afford loads of money ). But I know it would take a lot of time not to mention I'd risk losing everything I have saved on the computer. Will the upgrade I bought actually provide me with a new valid product number or do I already need to have one?