I have an old 13 inch white macbook. I have the original instillation CD for it. I want to reload the macbook from scratch. I don't care about any programs I may have on it or files. I put the disk in but it will not let me click on Install MAC OS X button. It says . You can't use this version of the application "install Mac OS X with this version of OS X. You have " install mac OS X" 23.1. I have snowleapered software CD What can I do.