Hi, all. sorry for my bad english, i'll try to write clearly. Using an original winxp pro cd, i create a cd patched with service pack 2. The installation go on with no problem. I have to use this cd to install xp pro in many machines each of them with their own license (and with there own cd-key in the label). My problem was at the request of the cd-key: the setup program say that it was invalid! I tried many cd-key: that of the original cd, the many written in the label of the pc. Nothing. Where did i fault? Maybe the cd i used was in some way banned (stolen cd-key from someone?). All the cd-key was from winxp pro, no winxp home. Some of them used to install in the past. Thank you all! Devrom