Getting .NET to work

I want to be able to run the .NET example at: http://at.php.net/manual/en/class.dotnet.php When I tried it on my Win XP Pro, SP2 machine using the CLI (command line) version of PHP I got: Fatal error: Uncaught exception 'com_exception' with message 'Failed to init .Net runtime [CoCreateInstance] Class not registered The DOCs said I need to install the .Net runtime to be able to use it so I went to: http://msdn.microsoft.com/netframework/technologyinfo/Overview/default.aspx and thence to http://msdn.microsoft.com/netframework/downloads/updates/default.aspx and was totally confused. Could someone please help out and say what, actually, I am supposed to download and how it should be installed Thanks, Csaba Gabor from Vienna