Keep on getting standard IIS site

[RudiHendrix]

After pulling back the support for the Cognos 11 Analytics installation I am trying to get Cognos 10 up and running again. All goes well but the configuration of the default website :(

I am tracing my steps and it looks I did everything right but adding the application. I accidentally added the application and added it to the default application pool. Afterwards I changed the application pool. Now I have removed those steps (removed the application, application pool etc etc) from IIS and added everything again. Just to see if that works. Right now if I go to http://localhost it displays the standard IIS web page.

If I go to http://localhost/ibmcognos/cgi-bin/cognosisapi.dll it displays a HTTP 500.19 error indicating:
HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.



Module
IIS Web Core

Notification
BeginRequest

Handler
Not yet determined

Error Code
0x80070005

Config Error
Cannot read configuration file due to insufficient permissions 

Config File
\\?\D:\Prog\COG\ibm\cognos\c10_64\cgi-bin\web.config



Requested URL
http://localhost:80/ibmcognos/cgi-bin/cognosisapi.dll

Physical Path
D:\Prog\COG\ibm\cognos\c10_64\cgi-bin\cognosisapi.dll

Logon Method
Not yet determined

Logon User
Not yet determined

And indeed there is no web.config file. But even if I copy that file from another environment it doesn't work.

Completely at a loss here :(