After activating Windows XP, you can verify that activation was successful by repeating Step 8 and then Step 9.
The Windows Product Activation window that appears in place of Step 10 should say "Windows is already activated. Click OK to exit."
Step by Step Guide to Changing the Windows XP Product Key
By Tim Fisher, About.com Guide
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- Click on Start and then Run
- Open Registry Editor
- Navigate to the WPAEvents Registry Subkey
- Click to Modify the OOBETimer Registry Value
- Select Part of the OOBETimer Value
- Change the OOBETimer Value
- Close Registry Editor
- Click on Start and then Run
- Open the Windows XP Activation Wizard
- Choose the Telephone Activation Option
- Click the Change Product Key Button
- Enter the New Windows XP Product Key
- Wait While the New Installation ID is Generated
- Reactivate Windows XP
- Confirm Reactivation of Windows XP
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