IPhone SDK installation problem

Hi All,
I have a problem installing the iPhone SDK.
In the installation process, "Installation Type" page, the page you can choose modules either you want to install or not. I see "iPhone SDK" module is listed, but i couldn't select it, it's greyed out and it is not checked by default. So i had to continue like this, after installation, i couldn't open any iPhone sample code at all. XCode said i don't have iPhone SDK installed.
I downloaded the SDK from ADC days ago.
I upgraded my mac to 10.5.4, also upgraded iTunes to 7.7
are there any other prerequisites?

excuse me i'm quite new to this community.
you mean the iphone sdk can not be installed on apple's own hardware?
is apple switching the focus to x86 architecture? are there any background information that i should take a look at?
appreciate it.

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