Error al Instalar SQL Server - SQL server setup media does not support the language of the OS

Aquí un vídeo tutorial que nos ahorrar un dolor de cabeza todos aquellos que nos hemos encontrado con el mensaje de error de "SQL server setup media does not support the language of the OS or does not have ENU localized files. Use the matching language-specific SQL Server media or change the OS locale through Control Panel" al querer instalar SQL Server 2008,SQL Server 2008 R2 o SQL Server 2012 en nuestra PC.

link: http://www.youtube.com/watch?v=6ulmj-CaHXE