Changing the Windows XP product key may be necessary if you discover your current key is pirated or illegal but you don't want to reinstall Windows XP to activate your new legal key. This can mad by changing Registry Key. To do this follow these steps
1. Click on Start -> Run and click OK
2. Type regedit and click OK.
3. In Registry Editor, locate the HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents registry key.
4, Click on the WPAEvents.
5, Select OOBETimer in right side of RegistryEditor
6, Right-click on the OOBETimer entry and choose Modify from menu.
7, Change at least one digit in the Value data text box and click OK. This will deactivate Windows XP.
8, Close Registry Editor
9, Click on Start -> Run and click OK
10,Type the following command in Run Window and click OK.
%systemroot%\system32\oobe\msoobe.exe /a
11, When the Let's activate Windows window appears, choose Yes, I want to telephone a customer service representative to activate Windows and then click Next.
12, Click the Change Product Key button at the bottom of the window.
13, Type your new, valid Windows XP product key in the New key: text boxes and then click the Update button.
14, You should now reactivate Windows XP by following the instructions on the Activate Windows by phone window which you should now be seeing or via the Internet by clicking the Back button and following the instructions on that screen.
If you'd rather postpone activating Windows XP until a later date, you can click the Remind me later button.
15, After activating Windows XP, you can verify that activation was successful by repeating steps 9 and 10 above.
The Windows Product Activation window that appears should say "Windows is already activated. Click OK to exit..
1. Click on Start -> Run and click OK
2. Type regedit and click OK.
3. In Registry Editor, locate the HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents registry key.
4, Click on the WPAEvents.
5, Select OOBETimer in right side of RegistryEditor
6, Right-click on the OOBETimer entry and choose Modify from menu.
7, Change at least one digit in the Value data text box and click OK. This will deactivate Windows XP.
8, Close Registry Editor
9, Click on Start -> Run and click OK
10,Type the following command in Run Window and click OK.
%systemroot%\system32\oobe\msoobe.exe /a
11, When the Let's activate Windows window appears, choose Yes, I want to telephone a customer service representative to activate Windows and then click Next.
12, Click the Change Product Key button at the bottom of the window.
13, Type your new, valid Windows XP product key in the New key: text boxes and then click the Update button.
14, You should now reactivate Windows XP by following the instructions on the Activate Windows by phone window which you should now be seeing or via the Internet by clicking the Back button and following the instructions on that screen.
If you'd rather postpone activating Windows XP until a later date, you can click the Remind me later button.
15, After activating Windows XP, you can verify that activation was successful by repeating steps 9 and 10 above.
The Windows Product Activation window that appears should say "Windows is already activated. Click OK to exit..
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