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Microsoft Knowledge Base article Q321636 contains:
This article describes how to change the Windows Product ID
for a current installation of Windows XP.
If you acquired an
additional license, you may have to change the Product ID to activate a second
installation of Windows XP by using your original CD-ROM. If you installed
Windows XP on a second computer by using the original CD-ROM, and then
purchased another copy of Windows XP, you may want to change the Product ID and
then activate the new installation, instead of reinstalling Windows
XP.
See the "More Information" section of this article for details
about the purchase of an additional license for your retail version of Windows
XP.
MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.When you acquire a new Product ID for your Windows XP installation, follow these steps to change the Product Identification number:
- Start Windows XP.
- Click Start, and then click Run.
- In the Open box, type regedit, and then click OK.
- In the left pane, locate
and then click the following
registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents
- In the right pane, right-click the OOBETimer binary value, and then click Modify.
- Change at least one digit of this value to deactivate Windows.
- Click Start, and then click Run.
- In the Open box, type the
following
command, and then click OK:
%systemroot%\system32\oobe\msoobe.exe /a
- Click Yes, I want to telephone a customer service representative to activate Windows, and then click Next.
- Click Change Product key .
- 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.
For more information about Windows Product Activation, visit the following Microsoft Web site:
http://www.microsoft.com/piracy/basics/activation/mpafaq.asp#policies
For more information about how to purchase a second license for your current copy of Windows XP, visit the following Microsoft Web site:http://www.microsoft.com/windowsxp/pro/howtobuy/pricingretail.asp
NOTE: You can also purchase an additional license for a retail version of Windows XP by calling (888) 571-2048 (United States only).For additional information about Windows Product Activation, click the article numbers below to view the articles in the Microsoft Knowledge Base:
302806 Description of Microsoft Product Activation
302878 Frequently Asked Questions About Microsoft Product Activation