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Powerbooks can't install 10.6 or higher, and certainly not 10.7.5. Please update your signature with either the Powerbook's operating system, or more accurately describe what is 10.7.5 on. Look on your screen or the bottom of your machine to determine what type of notebook you have if you have a notebook. Let us know if you need help determining what you have here is Apple's http://support.apple.com/kb/HT1274 which explains how to reset your password.