NicolasMichael I would recommend reviewing the PDApp.log file for the specific error message. You can find details on how to locate and interpret the PDApp.log file at Troubleshoot with install logs | CS5, CS5.5, CS6 - http://helpx.adobe.com/creative-suite/kb/troubleshoot-install-logs-cs5-cs5.html. You are welcome to post any specific errors to this discussion.
Has there been any recent changes made to your computer which could affect the installation of Creative Suite 6?