This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default - ASP.NET Forums

link -> This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default - ASP.NET Forums

I was able to resolve this issue in my own Windows 7 webserver using the Microsoft Web Installer Platform (http://www.microsoft.com/web/downloads/platform.aspx). 

• From the GUI or finding it in the IIS MMC manager, Click on the Web Platform tab
• Then click on the Customize link below the Frameworks and Runtimes options. 
• Select ASP.NET and ASP.NET MVC 1.0 (if necessary)
• and then click install. 

Should resolve your issue.  You can also probably do this without using the Web Installer Platform, but this was specifically the way I was able to resolve the same problem.

Had to do this to run sitemanager locally on IIS