How to find your product key for Windows 10
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The time will come when you might want to perform a clean install of Windows 10, and it is from this point that you will need this key.
You can not use your old version of Windows product key to activate Windows 10, but during the initial upgrade this key update process is converted into a new one. With the use of a dedicated tool, you can easily find the key that was generated for you, so you can take note and use it in the future if necessary.
There are actually many tools that can be used to determine your key Windows 10. One of the most reliable and complete is ProduKey , which is available for free. There are 32 and 64 bit versions available, so make sure you download the correct version for your system.
ProduKey is provided as a compressed file, so unzip it, and run it. Within seconds, ProduKey will provide you the Windows 10 key you need , and you can then copy to clipboard, send by email, or save another way to have it when you need it.