Takino, exactly when are you getting the error - nLite step? Please post a screen shot. Use only the latest version of nLite (1.4.9.1) , run nLite under XP, always start with a fresh copy of your CD (ISO) files/folders and run nLite only once. You also might try the copy of SP3 from the MS DL Center. Is the school's ISO modified in any way - any other program run against it? Enjoy, John. First step, as you can hopefully see in the attached file. The screenshot is done with win 7, but I tried it yesterday with win xp and got the exact same errors (why starting another PC for an screen :/). It was always a fresh copy every time I tried, I copied the files from CD to a different folder, I guess should be new enough. The sp3 doesn't do the trick, because it'a already in the orighinal CD. The isos from the university isn'tt modified in any way. It's the standard german xp-pro sp3 image.