Hi there, 1) a) In your winnt.sif you've got to have the following entries: [unattended] UnattendMode=FullUnattended OemPreinstall=Yes b) Put your regfile in your $OEM$ folder, e.g. regtweaks.reg, and then you must add to the cmdlines.txt the line(if not existing just create it and set [commands] as first line): "REGEDIT /S regtweaks.reg" c) Now your tweaks are integrated in the default user account, before any other account exists, so they are also integrated in every new created account. 2) HKEY_CURRENT_USER is the part of registry with information of the current logged on user, while HKEY_USERS is the part, where every user-specific registry-setting is stored, e.g. HKEY_USERS\.Default for the default user. So HKEY_CURRENT_USER user is also contained in HKEY_USERS