How to Change Windows XP License Key

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There are two (legal) methods that you can use to change the product key with volume licensing media after installation. You can use either the Windows Activation Wizard graphical user interface (GUI) or a Windows Management Instrumentation (WMI) script.
The easier method to use is the Use the Activation Wizard method. Use this method when you only have a few computers on which to change the product key. The Use a Script method is best when you have a number of computers on which you have to change the product key.
Legal Note: Make sure you understand that this method is indeed legal. This is NO crack, NO hack, there is nothing illegal with this article. I will not, however, encourage any reader to use an illegally obtained CD Key. What you do in your own house/office is your own business, and I cannot and will not be held responsible for your actions.

Method #1: Use the Activation Wizard

If you have only a few volume licensing product keys to change, you can use the Activation Wizard.

Warning! This document contains instructions for editing the registry. If you make any error while editing the registry, you can potentially cause Windows to fail or be unable to boot, requiring you to reinstall Windows. Edit the registry at your own risk. Always back up the registry before making any changes. If you do not feel comfortable editing the registry, do not attempt these instructions. Instead, seek the help of a trained computer specialist.

Note: Microsoft recommends that you run System Restore to create a new restore point before you complete the following steps:

1. Click Start, and then click Run.
2. In the Open box, type Regedit, and then click OK.
3. In the left pane, locate and then click the following registry key:

   HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents

4. In the right pane, right-click OOBETimer, and then click Modify.
5. Change at least one digit of this value to deactivate Windows.
6. Click Start, and then click Run.
7. In the Open box, type the following command, and then click OK.

   %systemroot%\system32\oobe\msoobe.exe /a

8. Click Yes, I want to telephone a customer service representative to activate Windows, and then click Next.
9. Click Change Product key.
10. 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.
11. Repeat steps 6 and 7 to verify that Windows is activated. You receive the following message:Windows is already activated. Click OK to exit.
12. Click OK.
13. Install SP1 for Windows XP.

If you cannot restart Windows after you install SP1, press F8 when you restart the computer, select Last Known Good Configuration, and then repeat this procedure.

Method #2: Use a Script

You can create a WMI script that changes the volume licensing product key, and then deploy this script in a startup script. The sample ChangeVLKey2600.vbs script and the sample ChangeVLKeySP1 script that are described in this section use the new volume licensing key that you want to enter, in its five-part alphanumeric form, as a single argument. Microsoft recommends that you use the ChangeVLKey2600.vbs script on Windows XP-based computers that are not running SP1 and that you use the ChangeVLKeySP1.vbs script on Windows XP-based computers that are running SP1. These scripts perform the following functions:

1. They remove the hyphen characters (-) from the five-part alphanumeric product key.
2. They create an instance of the win32_WindowsProductActivation class. They call the SetProductKey method with the new volume licensing product key.

You can create a batch file or a CMD file that uses either of the following sample scripts, together with the new product key as an argument, and either deploy it as part of a startup script or run it from the command line to change the product key on a single computer.

ChangeVLKeySP1.vbs

\ \WMI Script - ChangeVLKey.vbs \ \ This script changes the product key on the computer \ \***************************************************************************   <!-- Adkit freestyle placement -->[adkit: zone="freestyle" limit="1" list="0"] <br><br><br> [netshelter]ON ERROR RESUME NEXT   if Wscript.arguments.count&lt;1 then Wscript.echo "Script can't run without VolumeProductKey argument" Wscript.echo "Correct usage: Cscript ChangeVLKey.vbs ABCDE-FGHIJ-KLMNO-PRSTU-WYQZX" Wscript.quit end if   Dim VOL_PROD_KEY VOL_PROD_KEY = Wscript.arguments.Item(0) VOL_PROD_KEY = Replace(VOL_PROD_KEY,"-","") \remove hyphens if any   for each Obj in GetObject("winmgmts:{impersonationLevel=impersonate}").InstancesOf ("win32_WindowsProductActivation")   result = Obj.SetProductKey (VOL_PROD_KEY)   if err &lt;&gt; 0 then WScript.Echo Err.Description, "0x" &amp; Hex(Err.Number) Err.Clear end if   Next

ChangeVLKey2600.vbs

\ \ WMI Script - ChangeVLKey.vbs \ \This script changes the product key on the computer \ \*****************************************************   ON ERROR RESUME NEXT   if Wscript.arguments.count<1 then Wscript.echo "Script can't run without VolumeProductKey argument" Wscript.echo "Correct usage: Cscript ChangeVLKey.vbs ABCDE-FGHIJ-KLMNO-PRSTU-WYQZX" Wscript.quit end if   Dim VOL_PROD_KEY VOL_PROD_KEY = Wscript.arguments.Item(0) VOL_PROD_KEY = Replace(VOL_PROD_KEY,"-","") \remove hyphens if any Dim WshShell Set WshShell = WScript.CreateObject("WScript.Shell") WshShell.RegDelete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WPAEvents\ OOBETimer" 'delete OOBETimer registry value for each Obj in GetObject("winmgmts:{impersonationLevel=impersonate}").InstancesOf ("win32_WindowsProductActivation")   result = Obj.SetProductKey (VOL_PROD_KEY)   if err <> 0 then WScript.Echo Err.Description, "0x" & Hex(Err.Number) Err.Clear end if   Next

Example

The following example describes how to use the ChangeVLKeySP1.vbs script from a command line:

1. Click Start, and then click Run.
2. In the Open box, type the following command,
   where AB123-123AB-AB123-123AB-AB123 is the new product key that you want to
   use, and then click OK:

c:\changevlkeysp1.vbs ab123-123ab-ab123-123ab-ab123