[jcgrini]

Voici ce que j'ai trouvé sur un forum microsoft:
donc je n'ai plus à chercher pour le mode administrateur. il me reste à chercher à debloquer les réglages. Sur un autre site anglophone j'ai lu aussi que le compte administrateur était désactivé en mode normal dés qu'il y a plus d'un compte utilisateur.
Windows XP Home edition allows you to create multiple user accounts for your computer. Each user can log on separately with a unique profile with their own desktop and My Documents folders. Furthermore, users can be configured as either Administrators or Limited Users. When you create an account, you will have to choose which from these two options:

Administrator accounts. User accounts designated as Administrators have full control over the machine. They can install new hardware and software and can read system files and have full control over the system's settings. Administrators can create new user accounts and change other accounts information including passwords. If you gave Windows XP a list of users during install, these users were created as administrators.
Limited Users. These users, on the other hand, have very limited control over the computer. Limited users cannot change system settings, and they can't install any new hardware or software. This includes most video games, media players and chat programs.
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