Updated question..Cannot istall SQL Express Server on Vista Applies To:                WindowsWindows VistaPrograms When trying to dowload SQL Server 2008 R2 Express with tools SP1 (SQLEXPRWT_x86_ENU) File Version 10.50.2500.0 2/9/2012 308MB
I get the following dialogue box:

Microsoft.NET Framework
Unhanded exception has occured in your application.  If you click continue, the application will ignore this error and attempt to continue.  If you check Quit application closes

An error occured creating the configuration section handler for Us ...

Go to the complete details ...