Reactivate windows after changing HDD

[Need Help SSD]

I need the windows product key for the laptop registered on my microsoft account, as the hard drive in this computer has failed and I need to install another. I will need to reinstall windows on this machine but I need the product key that came with it. I still have the installation disk, but no key, and the label that was on the bottom of the laptop has become unreadable.

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