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to enter a 25 digit Windows XP Product Activation Key Code, which Windows XP promptly converts it into the system's product ID.
Because of security concerns about piracy, Microsoft does not provide a tool that allows you to view the Product Activation Key (or CD Key) that was used to install the operating system.
(The Product ID can be found by right clicking My Computer and choosing Properties.) To determine eligibility for the update, Service Pack 1 compares the Windows XP product ID on the system to this list.
The comparison and the list reside locally on the users PC and no information is sent to Microsoft as part of this process.
Service Pack 1 for Windows XP will fail to install on installations of Windows with one of the following product IDs: XXXXX-640-0000356-23XXX and XXXXX-640-2001765-23XXX The following message will be displayed if installation fails for this reason: Service Pack 1 Setup Error: The product key used to install Windows is invalid.
Please contact your system administrator or retailer immediately to obtain a valid product key.
(Please backup your system before attempting this.) This workaround is only for the corporate editions of Windows XP Professional using a compromised or illegitimate key.
Windows XP Home Edition and retail versions of XP Professional are not affected by Service Pack 1.Although this procedure may work with other versions of XP, we have only tested it on the corporate edition (volume license version) of Windows XP Professional.You may also contact Microsoft Corporation's Anti-Piracy Team by emailing [email protected] you think you have purchased pirated Microsoft software.Please be assured that any personal information you send to the Microsoft Anti-Piracy team will be kept in strict confidence.How to change your Product Activation Key in Windows XP If the product ID matches the invalid keys above, you may need to change the key (re-enter a valid key) in order to install Windows XP service pack 1, and to make sure your environment is legal.You could completely re-install Windows XP Professional or you can try the method below.