@prathapml Thanks for the guidance, re this, purhaps you could help me out, what i am trying to do is to create an unattended install cd for windows xp pro, as i have a couple of freinds that what to set up there pc the same as me so i can help then out with issues. But i dont know how to set it up using there licence codes, so i am looking for a way to allow them to enter there own key code. I think the best was is to leave the key code blank, and then they will be prompted, but the problem with this is that i have a retail version and she has a an oem version, so the key code will not work? any ideas?