When you upgrade your PC from Windows 7 or 8.1 to Windows 10, you perhaps don't know where your legit serial key is for the latest version of the Microsoft Product. The issue may come out when you desire to do a clean system installation, and in this case you'll need to have a new unused product key only. Cheap CD key and activation code for popular software like Office Professional Plus 2016, Adobe Acrobat DC for MAC, Visio Project, SQL Server 2016 and Antivirus Security: Where to buy it, How to find it and How it works. Microsoft tweaks activation rules for the Windows 10 Anniversary Update Redstone in 2017. If you have problem with operating system definition and want to repair or reinstall, you must have a 100% working windows 10 pro product key or digital purchase (DPK). Have you made any hardware change to your PC/MAC so that you can't activate? In this guide, I'll show you the best method to use a Activation Key to re-activate Windows 10.

Where do I purchase a Win10 Retail OEM Key?

• Most people will ask such question if they have already download a Windows 10 Copy. Usually, Microsoft Online Store will definitely sell the license to you. But their's price is too expensive. If I'm willing to pay the $199.99 for a retail license now, I won't find the method below which save me lots of money! Since the newest Windows 10 OS was a "free" upgrade from Windows 7/8/8.1, can I just buy a Win7 Product key and activate it, then upgrade to Win10 freely? The answer is Yes!

How to find legit serial key depends on the copy of Windows 10:

• If you bought Windows 10 from an authorized software retailer, there will be a lot of software license for sale. so the legitimate activation key will be on a label inside the CD/DVD package it came in. The installation ID is recorded in the Microsoft's activation database alongside the product key you entered with the installation.

• If you bought a digital copy of Windows 10 home product key from Microsoftstore.com online shop, the win10 product code will be in the confirmation email you received after buying it or will be distributed digitally as an entitlement, in which case you won't receive a product number. For example, if you upgraded to Windows 10 for free, you'll receive an entitlement instead of a cheap product key.

• If you bought a new PC running Genuine Windows 10 Education vs Home vs Pro vs Enterprise, 32/64 bit, the product key will be Pre-installed on your PC and your PC will automatically be activated, included with the packaging the PC came in, or included on the Certificate of Authenticity (COA) attached to the PC.