HI, There is no difference in the winnt.sif for admin password when it comes to XP PRO, HOME. Both systems have local admin accounts. I too am not using quotes, and it works. Yes., MS is a bit mysterious with the unattend file format. Example: ProductKey="XXXXX-XXXXX-XXXXX-XXXXX-XXXXX" ProductID="XXXXX-XXXXX-XXXXX-XXXXX-XXXXX" ProductID works for me, But ProductKey is officially documentend everywhere, but does not work for me. ??? FYI, I use them both, without glitch. But I verified that ProductKey to be an issue for me. Maybe there is newer features in winnt.sif file format since SP2