Why can't I open Airport Utility?

Why won't it let me run application, AirPort Utility? Message says "You can't open the application 'AirPort Utility' because it is not supported on this architecture. I have a macbook running Leopard version 10.5.4. Please help! Thanks!

What version of OS X is installed on the machine? Maybe you need to reinstall OS X and then update to 10.5.5 via the combo updater.

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