finding your product key relies upon how you got your duplicate of Windows.
An product key is generally required while uninstalling or reinstalling Windows 7 or Windows 8.1. For the most part, in the event that you purchased an actual duplicate of Windows, the product key ought to be on a name or card inside the case that Windows came in. In the event that Windows came preinstalled on your PC, the product key ought to show up on a sticker on your gadget. On the off chance that you've lost or can't discover the product key, contact the maker.