Thanks to you walstib !
The version required to the installation software give me the clue I need to find out ! doing a google on "2.0.927.0" i've found that :
http://www.911cd.net/forums//index.p...c=14181&st=569 telling also that it is not necessary to instal XPe to get EWF & minlogon.
It seems that I forget to install the SP2 of my trial XPe. So now I got the right one and everything goes well !