When installing the Operations Manager 2007 web console on Windows Server 2008 you need to install the following IIS components:

This can also be installed with a powershell script:

Import-Module ServerManager
Add-WindowsFeature NET-Framework-Core,Web-Metabase,Web-WMI,Web-Static-Content,Web-Default-Doc,Web-Dir-Browsing,Web-Http-Errors,Web-Asp-Net,Web-Net-Ext,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Filtering,Web-Windows-Auth -restart