PostHeaderIcon How to change the serial number used in Windows XP, Valid for XP Corporate

Step 1

  • Open Start/Run... and type the command:
  • regedit and click "OK" (or press ENTER).
  • Go to HKey_Local_Machine\Software\Microsoft\WindowsNT\Current Version\WPAEvents,
  • on the right double click on "oobetimer" and change at least one digit of this value to deactivate windows.
  • Click "OK" and close the Registry Editor.

Step 2

  • Open Start/Run... and type the command:
  • %systemroot%\system32\oobe\msoobe.exe /a and click "OK" (or press ENTER).
  • This will bring up the "Activate Windows" window.
  • Check the option for "Yes, I want to telephone a customer service representative to activate Windows" and click "Next"
Step 3

  • Then click "Change Product Key" (don't enter any information on that screen)


Step 4

  • Type in the new key and click "Update"


The activate Windows by phone window will reappear at this point, just close it by clicking the X in the upper right hand corner

Step 5

  • Reboot your system and Open Start/Run... and type the command:
  • %systemroot%\system32\oobe\msoobe.exe /a and click "OK" (or press ENTER).
  • If you see "Windows is already activated" then everything is OK.
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