when trying to install Role Service 'Windows Authentication' on a Windows 2008 Server the installation fails with error code '0x80070643'. Details of the error are as follows:-
Web Server (IIS)
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Web Server (IIS): Installation failed
<Error>: Attempt to install Windows Authentication failed with error code 0x80070643. Fatal error during installation
The following role services were not installed:
Server is running Windows 2008 Standard SP2.