I just bought a new computer with Windows XP professional installed.
However, when I go to install the service pack from the Microsoft
site, it informs me after inventorying my system that the OS could be
a pirated version. When I asked the seller, he told me to use the
serial number on the XP CD that came with the computer. Now, the
computer came with the XP Professional shrink wrapped cd with its
serial number. How can I input this new serial number and register my
OS with Microsoft without having to do a fresh reinstall and deleting
all that has been saved to my computer?

Hi!!

The solution to your problem can be found at the Microsoft Knowledge Base  website:
"Microsoft Knowledge Base Article - 328874 - HOW TO: Change the Volume
Licensing Product Key on a Windows XP SP1-Based Computer":
This article describes how to change the Windows XP product key...
I recommend you the use of the Activation Wizard rather than scripts.
http://support.microsoft.com/default.aspx?scid=kb;en-us;328874


I hope this helps you.

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Request for Answer Clarification by havequestions-ga on 15 Mar 2004 19:39 PST

This link refers to volume licensing. I have only one computer and
only one license. Please clarify.
Thanks

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Clarification of Answer by livioflores-ga on 15 Mar 2004 20:27 PST

It must work in your version too, if not let me know and I will ask to
the editors to remove the answer.

Thank you.

try this click start, run in the open box type c:windows\system32\oobe\msoobe.exe /a