Basic Codeigniter setup on XAMPP isn't working

[eluser]steve_web[/eluser]
I installed the latest version of Codeigniter on my XAMPP install on Windows 7... however after following the basic first steps I seem to have completely borked something as basic hello world pages are not working (page not found).

Can anyone help point me to details about a correct install folder structure or provide help with what I've got so far?

c:\xampp\htdocs\codeigniter\

and thus:

c:\xampp\htdocs\codeigniter\application\[models|views|controllers]

Is this correct or have I done something dumb... e.g. is the "codeigniter" directory supposed to be there or should "application" and "system" be dropped directly inside the htdocs directory?

Even if someone has a basic setup with a single working Model, View, & Controller as a package I could peek at I'd love to see the setup... Its driving me nuts that I can't seem to get a simple setup to work.