How to change my Windows product key?

Changing the product key you used to install Windows may be necessary if you discover that your current product key is ... good, illegal, and you purchased a new copy of Windows to solve it. The incident.
Although it may be less common these days, many people still use product key or other illegal tools to get product keys that work to install Windows just to find out later. , when they try to activate Windows, their original plan will not exercise.
You can completely reinstall Windows using your new, valid lock code, but changing the product key without reinstalling is significantly easier. You can manually change the product key by making certain registry changes or by using the wizard available in the Control Panel.
Note: The steps involved in changing your product key vary considerably depending on the Windows operating system you are using. See what version of Windows I have? if you are not sure.
How to change the Windows XP product key
A completely different process is needed to change the Windows XP product key because you have to make changes to the Windows Registry. It's important to be careful when making only the changes described below!
Important: We recommend that you back up the registry keys that you are changing in these steps for additional prevention.
If you are not comfortable making a registry change to change your Windows product key, use the popular free product key finder called Winkeyfinder. This is a great alternative to manually changing the Windows XP product key.
Like screenshot? Try our step-by-step guide to changing Windows XP Product Key for easy instructions!
Open Registry Editor through Start> Run. From there, type regedit and click OK.
Locate the HKEY_LOCAL_MACHINE folder in My Computer and click the plus sign (+) next to the folder name to expand the folder.
Continue to expand the directory until you reach the following registry key:
HKEY_LOCAL_MACHINE \ Software \ Microsoft \ WindowsNT \ Current Version \ WPAEvents
Click the WPAEvents folder.
In the results appear in the right pane, locate OOBETimer.
Right-click on the OOBETimer entry and select Modify from the resulting menu.
Change at least one digit in the Value data text box and click OK. This will deactivate Windows XP.
Please close Registry Editor at this time.
Click Start and then Run.
In the text box in the Run window, type the following command and press OK.
% systemroot% \ system32 \ oobe \ msoobe.exe / a
When the Let's activate Windows window appears, select Yes, I want to call a customer service representative to activate Windows and then click Next.
Click the Change product key at the bottom of the window.
Tip: Do not worry about filling in anything on this screen. It's not necessary.
Enter your new valid Windows XP product key in the New key: text boxes and then click the Update button.
Now re-enable Windows XP by following the instructions on the Windows Activation window using your phone, you will see it now, or over the internet by clicking the Back button and following the instructions on that screen. .
If you want to postpone Windows XP activation until a later date, you can click the Remind me later button.
After activating Windows XP, you can verify that the activation succeeded by repeating steps 9 and 10 above.
The Windows Activation Product window should now say "Windows has been activated. Click OK to exit."