Hi ricarzd,
Please refer the Kb Doc : http://helpx.adobe.com/creative-suite/kb/error-exit-6-exit-7.html.
Please see 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
Regards,
Rave