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How to Change Microsoft Windows and Office Product Keys
Sometimes a Microsoft product key shown in Belarc software doesn't match the key on the Microsoft sticker, or only shows a few characters of the key. One common cause of this is that the software was pre-installed by the computer manufacturer and your personal product key was sent on a separate card or sticker. Computer manufacturers often use their product key, instead of yours, when pre-installing software at the factory so that's the key you're seeing.
Another common cause is that the Office 2013 installers remove all but the last five characters of the install product key once the installation completes.
To change the product key currently on your computer (and reported by Belarc) to your full personal key follow the steps outlined below.
Windows product keys
Finding your Office 2013 product key
You can see the product key that is used to install office by signing into your office.com account here. Once signed in, choose Install from a disc under Account Options. You'll see your office installation product key to the right of your options.
Office 2010 and later product keys
Note: You must have an internet connection to reactivate Office online. However, you can also activate Office at a later time by opening any Office app, clicking on the File tab, and selecting Help.
Office 2007 and earlier product keys