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Most parts of commercial applications come with some form of protection to prevent unauthorized copying and installation. Although application manufacturers use different methods to achieve this goal, a common strategy involves asking the user to enter a product key or serial number, which is true for Microsoft Windows and Office.
This series of letters and / or values is a unique identifier that the program decodes to confirm that your copy is legal. You must authorize the installation of the software and your eligibility to obtain product service; therefore, it is important that you know where it is and how to get it.
Below are some easy methods for locating the product key for Windows and Office.
[More info: Our best Windows 10 tricks, tips and tweaks]
Locate your product key
Try to remember how you purchased Microsoft software, which decides where to look to find the item's key.where to enter microsoft office key

In case you have purchased a commercial copy of Microsoft Windows or Office, the first place to look is the disc box. Microsoft retail product keys are usually on a glossy sticker found inside the instance with the entire CD / DVD or on the back. The key consists of 25 alphanumeric characters, usually divided into groups of five. For Microsoft Office, you will find the sticker on the installation disc that followed the PC. If all else fails, you will need to contact Microsoft to obtain a replacement key.
You can usually find your Microsoft Windows product key on a sticker attached to a PC.
Windows 10
Fundamentally, you have a digital right if you upgraded your PC from Windows 7 or 8.1 at no cost. You will also have a digital entitlement if you pay for a Windows 10 update via the Windows Store or do a fresh installation of Windows 10 and pay for it at the Windows Store.
However, if you purchased Windows 10 simply by purchasing a new PC, purchasing a Windows 10 installation DVD, or purchasing a digital copy of Windows 10 from a retailer other than the Windows Store, after which you have an essential traditional product , not an electronic right.

Exactly what an electronic right means
If your PC has an electronic right, Microsoft will keep a list of your right to run Windows 10 on its own servers. The good thing about the system is that there are no essential items to launch. If you need to do a new installation on the USB drive, for example, it will not be necessary to start your PC. Instead, after reinstallation, Windows will activate in the background within a few hours (or, at most, a few days).
The only thing to remember is that your digital entitlement is based on the system configuration. If you change too many components at once and try to reinstall Windows 10, you're in trouble. This is an unusual problem, but it is important to remember if you are considering replacing the hard drive or SSD and expect to make some additional updates at the same time.