Orio, On an aside not sure why it would be different for a laptop, but I have a personal copy installed on my machine at home and at work single serial number, 2 machines, which is possible and allowed according to the Adobe rep I spoke with when I purchased CS2. We also have a work copy loaded on 2 machines in the same office. As long as you don't have both copies open at the same time or are not connected to the network, we're OK. You might want to give Adobe a call and see if they can tell you how to get authentication for you lap top unless they are telling us both 2 different stories. Good luck, g.