[Solved] Windows 7 IIS (HTTP Error 500.21 – Internal Server Error)

When I tested the website today, when I entered http://localhost/ in the browser, the following error occurred:

HTTP Error 500.21 – Internal Server Error

Handler “WebServiceHandlerFactory-Integrated” has a bad module “ManagedPipelineHandler” in its module list.

Reason: After installing Framework v4.0, and then enabling IIS, the Framework is not fully installed

Solution: Start->All Programs->Accessories->Right-click on “Command Prompt”->Run as Administrator->%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

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