IIS 7.0 Error: This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either...

This usually happens when attempting to run a web application via. IIS, but you don't have the required windows features (I.e. ASP.NET enabled in IIS).

To check/enable this, you do the following...

[Windows 7]

Start > Control Panel > Programs and Features > "Turn Windows features on or off" (left menu)

This will provide you with a pane of enabled windows features (unlike windows XP, you do not need to uninstall these to disable them)

Navigate to "Internet Information Services" > "World Wide Web Services" > "Application Development Features" and check the following options...

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