Symptoms
You cannot download Windows Genuine Advantage (WGA) updates on a Microsoft Windows XP-based computer that you purchased from an Original Equipment Manufacturer (OEM).
Resolution
To resolve this issue, follow these steps:
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Click Start, and then click My Documents.
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On the Help menu, click Is this copy of Windows legal?
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Follow the instructions on the Web page to validate your copy of Windows.
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After you have successfully validated your copy of Windows, you can download WGA updates.