I ran into this problem today when I had top stop the install of CRM 2013 at the end when it tried to put in the reporting extensions.
http://www.interactivewebs.com/blog/index.php/general-tips/crm-2013-reporting-is-not-enabled-message-in-crm-deployment-manager/
The original reason it wouldn't install was that the reporting services (SSRS) service account matched the same account that CRM was using for it's services.
