It was from a full source. Well, i added all the files missing to the install directory, there were about a dozen. I think i'll just rebuild my 7zip archive from that. It suppose it should keep fine like this ? Thanks. EDIT : The install finished but Powerpoint complains now about the chipart missing and don't want to let use it. There's something going really bad ... EDIT 2 : Alright, fixed now. I just didn't install from a *real* clean install since i first uninstalled Office 2003. About the Powerpoint issue, i had to modify my MST and add all the cliparts. Without them, Powerpoint always complained at startup. Don't know why ... it didn't happen with SP1.