I try to install ArcGIS Server version 10.
Everything worked fine with installing the GIS Services.
The Server is running. I can create services and see them in ArcCatalog.
But when I try to install the Web Applications I couldn't select the "Applications Manager".

I try to install it on Windows Server 2008 (64bit) with IIS7.
I double checked the settings and [required extensions for IIS](http://help.arcgis.com/en/arcgisserver/10.0/install_guide/arcgis_server_net_install_guide/index.html#/Windows_Server_2008_R2_IIS_requirements/00890000000n000000/) and it seems to be correct.
I even changed the IIS seting from 64bit to 32bit.
But the "Application Manager" in the Select Feature Dialog is still not shown.

I appreciate any help with this.

Kai