Why can't I log on to my MacBook Pro?

I have entered my password repeatedly and nothing happens. I've restarted, tried to start with installation cd and nothing happens.
I just keep getting the login box. This is driving me nuts. I have Snow Leopard. Any ideas?

hold down the option key while your booting to boot from the cd
once your in the installer click on "utilities" on the top of the screen to get to the password reset utility

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