Cant reinstall fedora core 3

I have fedora core 3 installed, i want to reinstall it, so i put in the cd, and go threw the steps, and when it goes to detect for the fedora installations if there are any on the hd, it just shuts down and says if is now safe to shut down the computer now.

What am i supposed to do, how can i clear the hard drive?

 

 

 

 

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