Error: HTTP Error 500.21 - Internal Server Error

Error: HTTP Error 500.21 - Internal Server Error

Error:
HTTP Error 500.21 - Internal Server Error
Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list


Solution:
This error points to .NET 4.0 not fully being installed. To resolve this issue run the following command at the command prompt. Ensure to run the command prompt as admin.
​
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i


If I had been on a 32 bit system, it would have looked like the following:

%windir%\Microsoft.NET\Framework\v4.0.21006\aspnet_regiis.exe -i

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