I've just re-formatted two Win98 machines and upgraded them to XP Pro. Both PC's came with the OEM version of Office 2000. Unfortunately the discs have got mixed up and I do not know which installation code goes with which disc. I have heard that XP is intelligent enough to know when the wrong code for a particular CD is being entered. Does anyone know if this is true, and if I try the wrong one will I get another chance.