I installed IIS7 beta 3 through Web Platfrom Installer, when I try to connect to it from Internet Information Services (IIS) 7 Manager, I get the following error message:
could not load file or assembly microsoft.web.administration...
Edit: I am running XP SP3 and I do not have IIS 5.
According to their official documentation on this it can be installed on XP SP3
Q: What OS and SKUs are supported?
A: IIS Express is supported on the following operating systems: Windows XP SP3+ Windows Vista SP1+ Windows 7 Windows Server 2008 Windows Server 2008 R2 Windows Server 2003 SP2+
From your question it appears that you are looking for ways to configure IIS Express. As Kat implies, IIS Express doesn't ship IIS Manager like tool (unfortunately).
One way to configure IIS Express short of editing configuration file directly is to use command line tool appcmd.exe that can be found in installation directory of IIS Express.(http://stackoverflow.com/questions/4690358/iisexpress-user-interface)
If you try connecting to your IIS Express instance using IIS Remote Manager or "proper" IIS, then it is not supported.
In addition to this, remote access to IIS Express is not enabled by default. Refer to this blog post to enable remote access to IIS Express/WebMatrix.
