Answer:
To find an installed Windows 8 product key is useful and necessary as you will need to re-install your system in future and type the product key to active it.If Windows 8 came preinstalled on your computer, your product key should be on a sticker on your computer or with your documentation.
Fortunately, if you can't find documentation of your Windows 8 product key, you may be able to extract it from the Windows Registry using a program called a product key finder.
Follow the steps below to find your Windows 8 product key using one of these tools.
A product key finder program will only find your valid Windows 8 key if Windows 8 is installed and working, and if you've manually entered the Windows 8 product key in some previous installation. See my Windows Product Keys FAQ and Key Finder Programs FAQ pages for more information.
1. Download product key finder program with full Windows 8 support. As manually locating the Windows 8 product key in the registry isn't possible so you'll need to use a program like this.
2. Install the program on your Windows 8 computer and run it.It will auto start finding your Windows 8 installed system product key as well as other installed program product key.
Note: Any product key finder that advertises support for Windows 8 will work for either edition: Windows 8 or Windows 8 Pro, and very likely both editions of Windows 8.1.
3. After seconds it will show you all your installed program product key and display them all for you. You can backup these serial number as txt.file to other place.
The Windows 8 product key is a series of 25 letters and numbers and should look like this: xxxxx-xxxxx-xxxxx-xxxxx-xxxxx.Write down the Windows 8 key exactly as shown for use when reinstalling Windows 8.
Important: Make sure each and every letter and number is written exactly as shown. If even one digit isn't transcribed correctly, the key won't work to reinstall Windows 8.
