I've found the problem (I think): Basically it haas to do with these two lines in the Nlite.inf file: And with this line in Cmdlines.txt What happens is that Cmlines is processed when actually logged on as Default User so there is a RunOnce entry made in de Default User Profile. What is supposed to happen in the Nlite.inf files after the first person logs on is that NliteReg should be run again (?why?) and afterwards the RunOnce key should be made empty using the nliteinf,S command. These commands are actually removed from the HKU\.Default key, but when I use regedit to load the Default User hive (ntuser.dat), I notice that the RunOnce entries are still there! So whenever a user logs on the RunOnce entries are proccessed causing an Advanced Inf Install Error. I have worked around this problem by adding these lines to the cmdline.txt: And nlite.inf I've removed these 3 lines. What the exact problem is, I do not know. Anyone?