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1. Turn Off Internet Before Activation.
2. Run "Activator.exe" as Administration.
By Genuine Key:
1. Open your word document or other applications like Excel, PowerPoint, etc.
2. Choose "File" then "Help" in the menu.
3. Then click "Change Product Key" in the right list.
4. Then a dialog box apears and enter your product key in the blank. And click "Continue" like this.
5. There are two options in another new dialog box. Choose "Install Now".
6. A process window pops up. Wait for a few minutes.
7. Then you can see it is finished and click "Close" to exit.
8. Well, you have changed the Product Key of Microsoft Office 2010.