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Why do I need to chane my windows key? PDF Print E-mail
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Why would you need to be able to change the Windows key unless you have an illegal copy?

Microsft it self has provided a Help topic for chaning your Product Key here is the reason why?

If you use a "leaked" product key (a product key that is known to be available to the general public) for the deployment of Microsoft Windows XP across multiple computers (a Volume Licensing installation), you may not be able to install Windows XP Service Pack 1 (SP1) or automatically obtain updates from the Windows Update Web site. For example, you may experience the symptoms that are described in the following Microsoft Knowledge Base article when you install Windows XP SP1:Error message: The product key used to install Windows is invalid.
SYMPTOMS
If you try to install Microsoft Windows XP Service Pack 1 (SP1), you may receive the following error message: The Product Key used to install Windows is invalid. Please contact your system administrator or retailer immediately to obtain a valid Product Key. You may also contact Microsoft Corporation's Anti-Piracy Team by emailing This email address is being protected from spam bots, you need Javascript enabled to view it if 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.

CAUSE
This issue may occur if the product key that you are using to install Windows XP matches a product key that Microsoft has determined to not be valid. These two product keys create a product ID that matches one of the following product IDs (where X is any numeric value):

XXXXX-640-0000356-23XXX XXXXX-640-2001765-23XXX XXXXX-640-643718x-23XXX XXXXX-641-309376x-23XXX XXXXX-642-064580x-23XXX XXXXX-642-464364x-23XXX XXXXX-643-334701x-23XXX XXXXX-644-081772x-23XXX XXXXX-644-451265x-23XXX XXXXX-644-874896x-23XXX XXXXX-644-933704x-23XXX XXXXX-644-962396x-23XXX XXXXX-645-833254x-23XXX XXXXX-645-994962x-23XXX XXXXX-646-031843x-23XXX XXXXX-646-104081x-23XXX XXXXX-646-105103x-23XXX XXXXX-647-318838x-23XXX XXXXX-647-592029x-23XXX XXXXX-647-677834x-23XXX XXXXX-648-301691x-23XXX XXXXX-648-819992x-23XXX XXXXX-649-106765x-23XXX XXXXX-649-941392x-23XXX XXXXX-650-292312x-23XXX

If you have any of the about Product Ids as yours Matching then You should contact your dealer! and get a new product key hence you dont wann reinstall windows losing all your data this is why winkey provides this facility. And for administrators who just dump HDD image on all computers and need to change the keys!
 
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