I have two (2) 2008 R2 SQL servers which do not have Replication installed. I acquired a download file from Microsoft Downloads of 2008 R2 SQL so that I could add the Replication feature. Via Control Panel > Add or Remove Programs > SQL Server 2008 R2 > Add features, I then navigate to the install file to begin the setup, at which point it says that Microsoft .NET Framework 3.5 SP1 install has failed, and that it is required for the SQL Server feature to be added.
In the Programs List, .NET 3.5 SP1 is already installed, so I do not know what could be causing this. Neither server has internet access and both are running on Windows Server 2003.
EDIT:
Thanks for the replies so far - I've looked into some of the suggestions and nothing has resolved the issue so far.
As far as I can tell, I have valid, full version installation files from Microsoft's Downloads, and the .NET Framework is installed and working correctly (ran a fixit tool for the Framework).
I collected some extra information to show you though in case it might be helpful to better describe what's happening:
Steps taken to edit current 2008 R2 installation:
Step 1
Step 2
Step 3 - this is where I encounter the error
Here is some system & server information about the machine, SQL Installation, and .NET Framework: