How to alter Windows Product ID

1. Go to Start->Run and type the following in the Run dialog box regedit

2. After you open the Registry Editor, navigate to the following key HKey_Local_Machine\Software\Microsoft\WindowsNT\Current Version

3. On the right hand side, you can see an entry by name ProductID listed under the heading Name.

4. Double-Click on ProductID, a dialog box will pop-up showing your Windows PID. Now you can delete the original PID and enter anything of your choice.

5. Once you are done, just click on OK and close the Registry Editor. Now you can see the altered Product ID in the Windows Properties window.
NOTE: This trick works on Win 7,Vista and Win XP

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How to alter Windows Product ID