1. Get Windows 10 Serial Number
2. How To Change Product Key Windows 10
3. Changing Product Key Windows 10
4. How To Change Windows Password

Click Yes, I want to telephone a customer service representative to activate Windows, and then click Next. Click Change Product key. Type the new product key in the New key boxes, and then click Update. If you are returned to the previous window, click Remind me later, and then restart the computer. How to change Windows 10 product key using Control Panel. Use the Windows key + X keyboard shortcut to open the Power User menu and select System. Click the Change product key link under the Windows activation section. Type the 25-digit product key for the version of Windows 10 you want. Click Next to complete the process.

Case 1: In future days when Windows 10 isn’t free anymore, if you lost the product key after installing a genuine copy of Windows 10 on your PC, how can you find the key in case one day you need to reinstall Windows 10?

Case 2: Now if you upgrade your PC to Windows 10 from Windows 8.1/8, you won't need any Windows 10 product key, but just need your original Windows 8.1/8 product key to carry you through the upgrade. However, after upgrading, it generates a new product key for Windows 10 and you have to find the key before you can do a clean installation of Windows 10.

In any case, now here we show you how to find the product key for Windows 10.

Way 1: How to find Windows 10 product key on an existing installation

No matter you use Windows 10 by free upgrade or genuine installation, you can easily find the product key by using iSumsoft Product Key Finder program, as long as your current computer still can run normally.

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Step 1: Product Key Finder download and installation

Download the iSumsoft Product Key Finder program and install it on your computer.

Step 2: Find the product key for Windows 10

1. Launch the Product Key Finder.

2. Click on Start Recovery button. Then it immediately displays all the product keys for the genuine software including your Windows 10 currently installed on your computer.

Get Windows 10 Serial Number

Step 3: Save the Windows 10 product key that has been found

A product key is generally a combination of letters and numbers, which usually has 25 characters so that it’s difficult to remember or manually input it. Hence, it’s necessary to back up the product key and save it in a safe place so that you can easily find and copy it whenever you need to use it.

Now iSumsoft Product Key Finder makes it easy and convenient to back up the product keys. Just need to click on Save to File button to save all the key numbers into a Notepad file. Then you can open the Notepad to view, copy, and paste the product keys.

Way 2: How to find Windows 10 product key depending on how you get it

How To Change Product Key Windows 10

If you bought Windows 10 but have never installed it on your computer or you’ve installed it but now system can’t start normally on your computer, how can you find the product key for installing/reinstalling Windows 10? It depends on how you bought your Windows 10.

1. If you bought a new PC with Windows 10 pre-installed, the product key can be in the packaging or on the Certificate of Authenticity attached to the PC. Or you can ask your PC's vendor for the number.

2. If you bought a copy of Windows 10 from the Microsoft website, the product key will be in the confirmation email you received after buying it.

Changing Product Key Windows 10

3. If you bought Windows 10 from an authorized retailer, the product key will be on a label inside the box it came in.

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Dll file fixer serial key only. If you’re running Windows 10 Home and want to know whether it’s worth moving on to Windows 10 Pro, there’s a straightforward way of switching between the two versions of Microsoft’s latest operating system.

All you need to do is swap your current Windows 10 Home product key for the default Windows 10 Pro one which Microsoft has made available to all users.

On the Microsoft Community Forums, Charles of Microsoft says:

From your Windows 10 Home running Version 1511, enter the Windows 10 Pro Default key under change product key.

VK7JG-NPHTM-C97JM-9MPGT-3V66T

This default key will not activate the system, just take you to Pro so you can activate using a valid Pro key that you will provide.

Once you have done this, the system will go through an upgrade process from Home to Pro, but will not be activated on Pro.

As you can see from the above, while this will upgrade your copy of Windows 10 Home to Pro, what it won’t do is activate it. If you decide you like the Pro version, you will need your own product key to activate the OS and use it permanently.

To switch product keys, open Settings and go to Update & security > Activation > Change Product key. Enter the product key from Microsoft (VK7JG-NPHTM-C97JM-9MPGT-3V66T) in the space provided. The upgrade process takes quite a while to complete so be patient.

How To Change Windows Password

If you want to buy a key for Windows 10 Pro, go the Activation page in Settings and click the Go to Store button.