User is getting the following error:
HTTP Error 500.21 - Internal Server Error
handler "PageHandlerFactory-ISAPI-4.0_32bit" has a bad module "IsapiModule" in its module list
The error occurs because you have not installed all the required Internet Information Services (IIS) components.
To resolve this issue, go to the Control Panel > Programs and click 'Turn Windows Features on or off'. Make sure to select all the options and sub-options under the Internet Information Services module. 
Note: See the KB article for details on how to add the required components to IIS.
