What would happen if you don t put in the windows 7 product key after installation?

I had "upgraded" my laptop to windows 10 from its default windows 7 and it made it slow and unusable. I had a windows 7 install disk so I figured I may as well reinstall windows 7 using the key on the laptop. Long story short; after hours of relocating all the drivers I need, I am promted with a window... show more I had "upgraded" my laptop to windows 10 from its default windows 7 and it made it slow and unusable. I had a windows 7 install disk so I figured I may as well reinstall windows 7 using the key on the laptop. Long story short; after hours of relocating all the drivers I need, I am promted with a window that tells me my key was invalid. The key on the bottom of the laptop doesn t work apparently.
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