Computer won't start up with Apple Install disk

Hey Guys,
My computer is running slow so I ran Disk Utility to see if my disk needs repair. It does but my computer will not start up with the Mac OS X Install DVD. It just hangs. It will start up with the normal system. If I start up holding the "option" key, it gives me the choice to startup with the Mac HD or Start Up disk. When I select Start Up Disk, it doesn't do anything other than the button changing color when I click on it. Nothing else happens. What's up?

I think there is a fail in the Mac Os x install dvd. Have you tried  the disc in Mac Os X to check if its allright..?

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