Windows web server 2008 R2 64 bit, CF9 64 bit, IIS7, ISAPI extensions and filters and II6 metabase compatability installed. OS is on C default, and trying to install CF to D:

Testing IIS and it shows index.html correctly from c:\inetpub\wwwroot at http://localhost/index.html

Then I install CF to D:\ , single standard server licence, select run with all IIS sites, select C:\inetpub\wwwroot as the web root for administrator, and when it gets to the bit where it is supposed to open up administrator to complete the installation it opens up the browser with a 500 error.

Now when I go back to http://localhost/index.html I also get a 500 error, if i uninstall CF I can again reach the html page.

CFIDE has been installed in C:\inetpub\wwwroot presumably correctly. Can anyone tell me where I'm going wrong please.

Update

The exact IIS error is

HTTP Error 500.0 - Internal Server Error
The page cannot be displayed because an internal server error has occurred.

Module  IsapiModule
Notification    ExecuteRequestHandler
Handler AboMapperCustom-28262
Error Code  0x800700c1
Requested URL   http://127.0.0.1:80/test.htm
Physical Path   C:\inetpub\wwwroot\test.htm
Logon Method    Anonymous
Logon User  Anonymous