In IIS, why doesn’t Window Authentication show up as one of the options for the web application

asp.netiisiis-7windows-authentication

I'm reading about how to set up windows authentication for my web application on IIS 7. In the description they have Window Authentication as an option in IIS.
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I have windows authenication turned on for my machine(I'm on Windows 7 Professional 64bit) and I still don't see it as one of the authentication options for my web application. Why?
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Best Answer

I got hit by this and it was something as simple as having not started IIS Manager with 'run as administrator'. Very frustrating, but I got there in the end!