I have OEM XP Pro SP2 and am keen to investigate the security in earlier versions of XP Pro. I'd like to get a copy of an OEM XP Pro installation disk with SP1 and, if possible, without any service packs. I've checked ebay to see if there are any but it's drawn a blank. Does anyone know where I could get what one? Obviously, I have a valid XP Pro COA and assume that it would work with any OEM XP Pro installation disk.

Thanks for your time.