HTTP Error 500.21 - Internal Server Error Handler "ExtensionlessUrlHandler-Integrated-4.0" has a bad module "ManagedPipelineHandler" in its module list in IIS7.0 (MVC4.0)

To overcome this error go to command prompt right click on it and select run as administrator and type the following

%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

                                  or

%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i

You can get the bellow cmd. PFA

Note: Don't change the directory of CMD.