Exit Code: 6, Exit Code: 7 Installation Errors -
http://helpx.adobe.com/creative-suite/kb/errors-exit-code-6-exit.html
Troubleshoot with install logs | CS5, CS5.5, CS6 -
http://helpx.adobe.com/creative-suite/kb/troubleshoot-install-logs-cs5-cs5.html for information on how to review your installation logs