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To resolve this issue, follow these steps:

1. Start Microsoft Internet Explorer, and then visit the following Microsoft Web site:
http://www.microsoft.com/genuine/diag
2. Click Start Diagnostics.

Note If you receive a dialog box that asks whether you want to run this file or to save this file, click Run.

The WGA Diagnostic Tool analyzes the computer and then lists the reasons why you cannot validate the copy of Windows XP. The WGA Diagnostic Tool may also list some error messages.

The most common problems are an invalid product key and a blocked volume license key. If the product key that is generated by the WGA Diagnostic Tool differs from the original product key, go to step 3. If this is not issue, see the "More Information" section to resolve the problem.
3. If the product key that is generated by WGA Diagnostic Tool differs from the original product key, you must change the product key back to the original product key. To change the product key, use the Windows Product Key Update Tool. To do this, visit the following Microsoft Web site:
http://www.microsoft.com/genuine/selfhelp/PKUInstructions.aspx
4. Follow the instructions on the Web site, and then try to validate Windows XP again


Here’s to Good Karma