A product key is a character sequence that acts as the license to a software product, and often required as proof of purchase. Also sometimes known as serial number.

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What happens to the Windows 7 key when upgrading to Windows 8? [closed]

Microsoft is offering "Microsoft Windows 8 Professional Upgrade" at a discounted price compared to the OEM version. However it states: If you currently have a personal computer running Windows 7, ...
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6answers
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How to find Windows 8 product key?

Does anyone know of a way to get the product key that was used to activate Windows 8? Bonus points for an updated algorithm to extract the product key from the registry key. While I realize this ...
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1answer
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Installing a different edition of Windows 8 on an OEM system

My PC comes with an OEM copy of Windows 8 (regular), but I only have a Windows 8 Professional DVD. Will Windows 8 automatically detect the edition associated with the product key in my BIOS and ...
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How do I retrieve a product key from another hard drive?

My friend's laptop motherboard died and he needs his Windows 7 product key from the hard drive (which is still working). I connected the old drive as a secondary drive to my own computer and tried ...
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2answers
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Is there a way to establish what version a Windows 7 product key is?

I have a Windows 7 product key that I foolishly did not label. Rather than downloading and creating disks for however many different ISOs exist (Basic, Pro, Ultimate, 32-bit/64-bit, upgrade, full ...
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5answers
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Install Windows 8 without a Product Key

Windows 8 setup asks for the product key at the beginning of the setup without letting you install it. I got the Windows 8 ISO from MSDN but I didn't get enough keys to install it on all my 7 ...
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3answers
15k views

Windows 7 product key does not work on Windows 10

I just did a fresh Window 10 installation from .iso files on the computer I was running Windows 7 on before. I have the original Windows 7 DVD's, with a valid key that I was using before. Now I tried ...
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5answers
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How to recover Windows Vista product key?

Two years ago I bought an Asus laptop with Windows Vista pre-installed. I also received a recovery DVD with it. I now want to reinstall Windows and fully format the hard drive - however, the sticker ...
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Change the Windows 8 product key after installation?

I just completed a fresh install of Windows 8 Pro as it was released to MSDN. Installation went without a hitch however I can't find out where to enter the correct product key for the copy I have. ...
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Is it safe that everybody can see the Windows product ID?

Is it safe that everybody can see the Windows product ID? What is my CD key given the product ID?
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1answer
6k views

Downgrade from Windows 7 Ultimate to Home Premium?

A few months ago, I acquired a Windows 7 Ultimate product key and updated from Home Premium to Ultimate. Well, now I get the "This copy of Windows is not genuine" message. I have the Home Premium ...
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2answers
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Does Windows 8 RETAIL install extract OEM product key from BIOS?

I am in a situation where I cannot use Magical Jelly Bean Product Key Finder since the hard drive has failed on a particular system from HP. Sadly HP will only sell restore discs and I don't have the ...
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Determine if Windows 7 is 32 or 64 bit from the product key?

Unable to start Windows to determine whether the version of Windows 7 Home Premium is 32 or 64 bit. The product key is available. That is all I have. Looking to acquire re-installation media but ...
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Windows 7 product key is blocked by activation server

I bought Windows 7 Ultimate from eBay around 8 months back. I got original Microsoft DVDs (for 32 and 64 bit) product sheet. To verify the genuinness, I activated the windows immediately after ...
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1answer
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How to get Windows 7 Product Key from old mac harddrive

I don't know if I am going to get an answer or if this is possible but here goes. On my old macbook pro, running Snow Leopard, I installed Windows 7 with bootcamp. The logic board crapped out on me ...
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3answers
5k views

Recover Vista install key from non-booting OS drive

A friend's Vista-based computer won't boot, so I am just going to format and reinstall. The problem is that she never kept her product key for Vista. Is there any way to recover that key from ...
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2answers
15k views

Windows product key is valid but wont activate

Last month, I needed to install Windows XP (Pro Version 2002 SP3) from a Reinstallation CD a co-worker gave me, and with a product key the IT team told me to use. Everything installed successfully ...
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8.1 to 10 setup : Something happened > Setup has failed to validate the product key

Just like millions of other users, I'm attempting to upgrade to windows 10. I have a Dell laptop running 8.1, which had windows reinstalled once. That was because I swapped the HDD out for a SSD and I ...