How to override the operation system on a hp laptop

trying to overide a operation system cd that was to clean my laptop off,but the product key can't be founed,and the cd want go backward or let me go forward,is there a way out.
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  1. Yes, go UP!

    You may want to post some more details as to what you did exactly, what disk you used, what steps you did when you installed the OS. Without a valid product key, once you started the setup and you got past formatting and file copy stage, the old OS is gone, you need to either buy a valid license key or put some legs under the laptop and call it a coffee table.

    Unless you did not actually get that far, what happens when you just reboot the computer?
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