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Change the serial number used in Windows XP

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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