How to Find Windows XP 25 Digit Product Key in the Registry

Written by mickey walburg
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How to Find Windows XP 25 Digit Product Key in the Registry
Find the XP Product Key in the registry. (keyboard image by Fyerne from

The Windows XP Product Key is a 25-character string of numbers and letters that is unique to each installation of the operating system. Periodic checks are done on this key to ensure that it is legitimate. If you have lost your product key or need to check it against what you think it is, you can find it in your Windows Registry by using the Registry Editor.

Skill level:
Moderately Easy

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  1. 1

    Start the Registry Editor by clicking the "Start" button, clicking "Run," typing "regedit" into the Run window and then hitting the "Enter" key.

  2. 2

    Use the navigation pane on the left side of the Registry Editor to go to the following location: "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"

  3. 3

    Look for the subkey labelled "ProductId," as this will list the XP Product key.

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