What is a product key?
A Windows product key is a 25-character code that's used to activate Windows. Activation helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow.
Your product key is on a card inside the box that the Windows DVD came in—or in an email that shows that you bought Windows. It looks like this: PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. If you bought a PC with Windows pre-installed, contact the PC manufacturer for the original key.
It's a good idea to save a copy of your product key for your records in case you ever need to reinstall Windows.
While reinstalling Windows 8 you will come to know that you will be needing product key to finish the installation.
Windows 8, as well as most operating systems and other software, require the entry of unique product keys, sometimes called serial numbers, during installation.
You may get your product key in the Windows 8 CD bought by you or if you have a PC with pre-installed Windows 8 you may find it on a sticker placed on your system.
However, if you have lost your documentation and unable to find your product key then you may retain it through window registry using a program called product key finder.
Note:- 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 Also: Windows 7 product key for 32/64 bit
You can find your product key using this program within few minutes. However, there are many key finder programs available to find your product key. You have to keep in mind those optional add-on programs, so be sure to uncheck those options during the program’s installation if you don’t want them support some. A few of them require no installation at all.
Steps to find your Windows 8 product key-
Step 1: Download Belarc Advisor, a free PC audit program with full Windows 8 support that also functions as a key finder tool. It is not possible manually to locate the Windows 8 product key therefore you will need a program like this.
Step 2: Follow all the instructions during intsallation of Belarc Advisor.
Step 3: Run the program to retain your product key. Note the Windows 8 product key displayed in the Software Licenses section.
Step 4: If you are still unable to locate your product key then you can ask for replacement product key from Microsoft or you can purchase a new copy of Windows 8.