I am installing SQL Server 2012 Developer (from ISO image written on DVD), my machine has Windows 7 (Edit: Windows 7 with service pack 1) and it already has SQL Express and SQL 2008 R2 Express installed in it.
On running 2012 setup it goes fine from Setup Support Rules to Installation Progress. In Installation Progress after some progress installation fails.
Windows show the following components couldn't installed: Managment Tools Complete Failed. Client Tools Connectivity Failed. Client Tools SDK Failed. Client Tools Backwards Compantibility Failed. Managment Tools Basic Failed. SQL Server Data Tools Failed. Reporting Services -Native Failed. Database Engine Services Failed. Data Quality Services Failed. full-Text and Semantic Extractins for Search Failed. SQL Server Replication Failed. Integration Services Failed. Analysis Services Failed. SQL Client Connectivity SDK Failed.
In detail for failure of every component it provide these details:
Action required: Use the following information to resolve the error, and then try the setup process again. Feature failure reason: An error occurred for a dependency of the feature causing the setup process for the feature to fail.
In summary log file it provide the following details: (see on pastebin.com)