How to Find the Product Key for Windows 10

Retrieve lost Windows 10 product key: two methods

Did you lose your product key after installing genuine Windows 10? Don't worry, this article will introduce two ways to retrieve your keys so that you can reinstall the system in the future.

Scenario 1: Windows 10 has been installed but the key is lost

Even if you get Windows 10 through free upgrades or genuine installations, you can easily find the product key using iSumsoft Product Key Finder as long as your computer works properly.

Method 1: Use iSumsoft product key finder

1. Download and install: Download and install iSumsoft Product Key Finder to your computer.

2. Find product key: Start the program and click the "Start Recovery" button. The program will immediately display the product keys for all genuine software, including the Windows 10 keys installed on your computer.

3. Save product keys: Product keys are usually composed of 25 letters and numbers, which are difficult to remember or manually entered. Therefore, it is very important to back up your keys and keep them in a safe place. iSumsoft Product Key Finder allows you to easily back up your keys. Just click the "Save to File" button and save all the keys to the Notepad file. You can then open Notepad to view, copy and paste the product key.

Scenario 2: Lost your key after upgrading from Windows 8.1/8 to Windows 10

If you upgrade from Windows 8.1/8 to Windows 10, you do not need the Windows 10 product key, you only need your original Windows 8.1/8 product key to complete the upgrade. However, after the upgrade, a new Windows 10 product key is generated, which you need to find before performing a completely new installation.

Method 2: Find the key according to the way of obtaining Windows 10

If you purchased Windows 10 but have never installed it, or have installed it but the system cannot boot normally, how can you find the product key to install/reinstall? It depends on how you buy Windows 10:

1. New PCs with Windows 10 preinstalled: The product key may be in the box or attached to the authenticity certificate on the computer. You can also contact your computer manufacturer to request a key.

2. Purchase from Microsoft's official website: The product key will be included in the confirmation email you received after the purchase.

3. Purchase from an authorized retailer: The product key will be printed on the label inside the box.

Other methods: You can also try other methods to find Windows 10 product keys without software (the specific methods are omitted here, please refer to the original "See also" section).

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