As long as you have the CD Key and the disc you get is post SP2 you can use whichever XP Pro CD you can get your mitts on. I have done that in the past a lot myself. The only thing you have to watch out for, if it's a Dell, you have to have a "Dell" Version of the Operating System. I have a disc I could make a copy of, but it is pre-SP2....just ask around for a SP2 or SP3 copy of XP Pro, and you can use the CD Key on the bottom of the laptop to install it.