I'm very happy to use vista but I got an Administration error.... My user is defined as an"Administrator" session and when I try to install something it tells"You do not have the correct rights. would you like to acquire them" and when I try to download something in an other place than "my documents" it tells me "You do not have the right to save here, please contact your system administrator to obtain permissions" Thanks,

Make sure your user account isa member of the Administrators group. It sounds like it is not.