How do I find my Windows 10 Product Key?

Like millions of others, I downloaded Windows 10 and installed it over Windows 8.1.  So I have no "sticker."  How do I find my Windows 10 product key, in case I need to reinstall someday?   Or, even if I never need to reinstall; just for my peace of mind?
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akahanAsked:
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JohnBusiness Consultant (Owner)Commented:
Either make a complete backup of it (which will capture the key), or keep your Windows 8 / 8.1 product key.

Your upgrade was only free with a base Windows 8 system so you need to capture the system with the Windows Backup (look in Action Center).
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Thomas GrassiSystems AdministratorCommented:
We use this software on win 8 and win 7

Not sure if it supports win 10

https://www.beitsmart.com/about/overview.asp

Go to the bottom of the page and select demo the Belarc client

It produces of a report hardware and software will show all product keys


HTH
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JohnBusiness Consultant (Owner)Commented:
The key is (I think) worthless by itself because it was an upgrade, not a base install.
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akahanAuthor Commented:
Belarc did it, thanks.   Whether it's useless or not, I feel better when I have the Product Key.  :-)
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Tapan PattanaikSenior EngineerCommented:
Upgrade to Windows 10 via Windows Update from Windows 7/8/8.1 registers your  computers hardware with a Microsoft Product Activation Server and then this system is  considered a Windows 10 device.

reinstallation can be done by making a Recovery Drive which is  an inbuilt function in Windows 10. The devices hardware is again resubmitted to the Microsoft and it is automatically activated.
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JohnBusiness Consultant (Owner)Commented:
Having the Product Key will NOT allow you to do a bare metal install of the Upgrade ISO. So you need a complete backup.
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akahanAuthor Commented:
Right, thanks, backing up the operating system to a bootable thumbdrive using its internal tool was of course the first thing I did after installing it.  :-)

And it's nice to hear that MS is able to use UEFI to "match" the OS to the machine, so that you don't have to make a note of your product key anymore.... but old habits die hard, and I like to have the product key written down somewhere anyway.
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McKnifeCommented:
"but old habits die hard, and I like to have the product key written down somewhere anyway" ? although you won't need it ever again?
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akahanAuthor Commented:
Yes.  That is what "but old habits die hard" means.
I'm not convinced yet that I won't ever need it.
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Eng. Nidal KamalInformation ConsultantCommented:
Good day,

If you have an image of working Operating System, all one has to do , if anything went wrong, is to restore the image.
One may use imaging software from Acronis or Backupper.

Acronis Web site is: http://www.acronis.com/
Backupper web site is: http://www.backup-utility.com/

It is much better than having a product key, because all applications and drivers will be restored with the image.
BTW, The image can be stored on USB, DVDs, another partition, or External Hard disk.
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akahanAuthor Commented:
I was more interested in reinstalling from scratch, but thanks.  I keep a current image backed up at all times.
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