Windows 7 IIS (HTTP Error 500.21-Internal Server Error) solution

When I was testing 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.

I looked for the reason on the Internet, and the result was

Reason: After installing Framework v4.0, enable IIS, resulting in the Framework not being 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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