404.3 error after installation

Guys,
 
I want to use HC8 panel to control my Web, Exchange and SharePoint server. I tried to install HC8 on web server but I got HTTP Error 404.3 - Not Found when I try to log in. I am trying to install it on windows 2008 R2 server and using MS SQL 2008 express edition.

Before installing HC with sql server 2008 then first install these compatible services, which will not effect anything in existing sql server 
Sql 2008 client services : http://hostingcontroller.com/english/forms/tech/hc/sql2k8-client.zip
 
Secondly make sure that IIS has been installed in the machine where HC will create panel administration site.
If still problem persists then check the installation log in c:\program files\advanced communication\hostingcontroller\log folder.

I have installed SQL 2008 client utilities and then re-installed HC8 but same problem appears. And yes IIS is also installed as it is a web server. 

It seems that asp.net extensions is not installed in IIS. Install it using the following command in cmd
c:\windows\microsoft.net\framework\v2.0.50727>aspnet_regiis.exe -i
 
After that try to login in HC panel.