If Windows came preinstalled this is how it works:

1. Windows 8.1 (x64) (build 9600)
2. Windows 8.1 Professional X64 Build 9600
3. Windows 8.1 Pro Build 9600 X86 / X64

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With Windows 8/8.1 The Product Key on preinstalled Operating Systems (HP, Acer, etc) is embedded in the BIOS in the Motherboard, so that the lost and/or worn C.O.A. Sticker problem is no more.

Windows 8.1 Professional (x64) (build 9600) Although 'System' identifies my OS as Windows 10 Pro, Belarc identifies it as 'Windows 8.1 Professional (x64) (build 9600)', not that it matters to me. It is what it is. May 05, 2014  Download Windows 8.1 Update for x64-based Systems (KB2919355) from Official Microsoft Download Center. Windows 8.1 Update for x64-based Systems (KB2919355) Important! Selecting a language below will dynamically change the complete page content to that language. Windows 8.1 PRO build 9600 32 or 64 bit Free Download 0 Windows 22:30 Windows 8.1 offers you the familiar desktop with its taskbar and start button, and a stunning new start screen that you can customize along with your favorite applications so that everything. May 12, 2019  It is clear that the activation will dismissed after installation, but Windows will be installed. To activate Windows 8.1 after, use activator from the link below. Retail activation keys for Windows 8.1 Professional on the phone or online. All activation keys for Windows 8.1. Windows 8.1 Product Key Serial Keys 25 Character Code. This code activate all the function of Windows 8.1 32 bit and Windows 10 64 Bit. When you are using Windows 8.1 and your windows do not work proper and you want repair or install new windows 8.1 but you need activation key, serial key, Product key. So it is so hard to find the latest key so do not worry you are on right site you can pic any key. We update key day by day regularly. Windows 8.1 Install Instructions To start the download, click the Download button and then do one of the following, or select another language from Change Language and then click Change.

When you reinstall it will pick up the Product Key and activate the system automatically.

If it does not or you have activation problems, follow these steps:

'How to Activate Windows 8 and 8.1 by Phone'

Follow these steps and do a Phone Activation and hold on for a real person to assist you.

To Activate Windows 8.1 by Phone

1. Do step 2, 3, 4, 5, or 6 below for what you would like or able to do.
2. Press the Windows + R to open the Rusluisn dialog, type slui.exe 4, press Enter, and go to step 7 below.
3. Open an elevated command prompt, type slui.exe 4, press Enter, and go to step 7 below.
4. Open the Power Users Tasks menu, click/tap on System, and go to step 5A below.
5. Open the Control Panel (icons view), and click/tap on the System icon.

6. Open PC settings, click/tap on Activate Windows on the left side.

Etc.

'Get help with activation errors'

'How to activate a Microsoft product by using Microsoft Product Activation Center'

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If phone activation is not available to you or does not let you contact Micosoft, you will have to use this method to contact MS support

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This information may interest you if you do wish to keep a record of it:

'Windows 10 Embedded Product Key Tool'

'We’re proud to introduce the immediate release of our newest utility for Windows users: the NeoSmart Technologies Embedded Product Key Tool. Designed for users of Windows 7, Windows 8, and Windows 10, our embedded product key tool will retrieve and display the Windows setup product key embedded in the BIOS or EFI, allowing you to store it for safe-keeping or use it to reinstall Windows with an official Windows setup image.'

You can also use:

'Belarc Advisor - Free Personal PC Audit (Version 8.5c)'

Or:

Windows 8.1 (x64) (build 9600)

'Product KeyFinder'

Windows 8.1 Professional X64 Build 9600

Cheers.

hello good day.. i have seriously problem with my windows 8.1 pro.. i have windows 8 install on my computer and its activated.. Microsoft windows keeps flashing message on my screen says update/upgrade into windows 8.1 for free so when i click on that message and its directly on windows page and i follow the instruction go to the store click upgrade/update for free so, when download is finish at least 8 hours downloading because my internet connection is slow. again flashing on my screen again says: RESTART so i re-start my computer when instillation finish says activate windows... why? i don't have product/activation key... where is free? why need to activate? i don't have money to buy the key for windows 8.1 pro build 9600 or something i didn't know the term of free upgrade?

Windows 8.1 Pro Build 9600 X86 / X64

note: Microsoft windows keeps flashing message on my screen says update/upgrade into windows 8.1 for free when i click directly to this is the article https://support.microsoft.com/en-us/help/15288/windows-8-update-to-windows-8-1