Setup could not detect {0} that should have been already installed. This indicates that setup hasn't updated the environment ...

Setup could not detect {0} that should have been already installed. This indicates that setup hasn't updated the environment changes after prerequisite installation. 

Please restart the installer to resolve the issue.
If you ran installer from command line window, it needs to be restarted as well.

If the issue isn't resolved after restarting the installer, resolve prerequisite manually as pointed out in this description.

Setup could not configure the application for auto-start. This is required for deploying services to the Windows Azure Service ... Setup could not connect to the web site. Tried both {0} and {1}. This could be due to the site or its application pool not ... Setup could not create a URL reservation for port {0}. Run the AOS installation again and select a different port number, ... Setup could not create the new Enterprise Portal Web site. The application pool associated with the virtual server {0} is ... Setup could not detect {0} that should have been already installed. This indicates that setup hasn't updated the environment ... Setup could not get the owner login from System.Security.Principal.WindowsIdentity to create a new Enterprise Portal Site. ... Setup could not install the Internet Information Services (IIS) 6 Metabase Compatibility feature because of an internal error. ... Setup could not remove auto-start configuration. Web Site: '{0}', Virtual Directory: '{1}', Application Pool: '{2}'. Error: ... Setup could not update the AJAX assembly entry in the Web configuration file. The AJAX assembly name is the invalid string: ...