Citation:
If you're desperately trying to start Firebird and nothing seems to work, ask yourself if you've installed Firebird 2 Classic server with the Guardian option enabled (the installation program doesn't offer this possibility anymore, but there are other ways). As said before, the combination Classic + Guardian currently doesn't work if Firebird runs as an application. Uninstall Firebird if necessary and reinstall Classic without Guardian, or Superserver with or without Guardian.
cependant , tu ne nous indique pas comment tu lances l'application ? (l'applet n'est pas fait pour cela et selon moi gère une installation en tant que service, mais c'est pareil , je ne l'installe jamais donc ce n'est qu'une supposition)