HTTP Error 500.0 - Internal Server Error caused by isapi com component

I have IIS7 开发者_开发百科and am trying to get a website working for development reasons (not production). So far, I'm getting

HTTP Error 500.0 - Internal Server Error

and so I can't get off square 1.

You are getting a COM error. The most common error is that you need to register the COM service on the server (the COM you will need to register is AboMapperCustom).

You register a COM using the regsvr32 utility.

Take a look at the event log to see what's the 500 error about.