download itunes 9Why can't i download itunes 9.0 on my brand new windows vista? i already try but after i finish nothin happens?

I also try uninstalling my old itunes so i can download 9.0 but everytidownload itunes 9me i try too, it's always half way done and my computer always freezedownload itunes 9s. it's annoying, someone please help.
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