How to Update and Change Windows XP Product Key

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Changing or modifying Windows XP product key is not a common practice after installation, especially if already activated.

Follow the guide below to remove and delete current product key used to activate existing copy of Windows XP, and force the OS to prompt user to enter new product key for activation.

1. Click on Start and then Run.

2. In the Open text box, type regedit and click OK to run Registry Editor program.

3. In the left pane, locate and then click the following registry key:

     HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents

4. In the right pane, right-click OOBETimer, and then click Modify.

5. Change at least one digit of this value in the Value Data to deactivate Windows.

6. Click Start, and then click Run.

7. In the Open box, type the following command, and then click OK:

     %systemroot%\system32\oobe\msoobe.exe /a

8. When the Windows Product Activation window appears, click Yes, I want to telephone a customer service representative to activate Windows, and then click Next.

9. Click Change Product key.

10. Type the new product key in the New key boxes, and then click Update.

If you are returned to the previous window, click Remind me later, and then restart the computer.

11. For user using OEM system or volume license product key (VLK), repeat steps 6 and 7 to verify that Windows is activated. User should receive the following message:

Windows is already activated. Click OK to exit.

For retail Windows XP users, a 30 days registration for activation reminder will appear. User will have to connect to Internet for online registration and activation, or call the local Microsoft activation hotline for phone activation.

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