Change or Reset a Microsoft Office Product Key

See Also:  Installing Microsoft Office on more than One Computer

If you have two Microsoft Office licences and install the wrong one on a computer, you can remove the Product Key and insert a new one, without reinstalling.

1. Close all Office applications that are open. Open the registry editor (Start –> Run –> type regedit)

2. Find the following registry key

32 bit Systems:

  • Office XP:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0\Registration
  • Office 2003:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\Registration
  • Office 2007:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0\Registration
  • Office 2010:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Registration

64 bit Systems:

  • Office XP:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Wow64\32Node\Microsoft\Office\10.0\Registration
  • Office 2003:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Wow64\32Node\Microsoft\Office\11.0\Registration
  • Office 2007:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Wow64\32Node\Microsoft\Office\12.0\Registration
  • Office 2010:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Wow64\32Node\Microsoft\Office\14.0\Registration

3. Back up the Registration registry key (if you need to restore the key you can double click on the exported file and it will restore the Registration registry key)

  1. Right-click the Registration subkey, and then click Export.
  2. In the Save in list, select a location to save the registration entries.
  3. In the File name box, type a name for the .reg file that you want to export, and then click Save.

Change or Reset the Office Product Key:registry Office Registration backup

5. Under “Registration” click on the GUID (Globally Unique Identifier) which looks something like this:


Registration GUID
7. Delete these two keys

  • DigitalProductID
  • ProductID

8. Open any Office application. You will be asked to enter the Product Key.


9. You may then be asked to activate the software:


10. If you have problems with activating please see: Installing Microsoft Office on more than One Computer

11. You can also use the Office Key Remover

Download Office Key Remover (click here)

Change or Reset the Office Product Key: Office Key remover

Instructions to change your Office Product Key

  1. Run Office Key Remover
  2. Choose which version’s license data you want to be removed
  3. Start one of the Office products
  4. Enter another Product Key once you’re asked (see screenshots above)

2 Responses to Change or Reset a Microsoft Office Product Key

  1. BusterRobby April 7, 2012 at 7:32 am #

    Thanks for the tips. I tried the removal tool and it works great. I had problems entering in a new key, but when I re-entered my ‘trial’ key, it reset the time back to 60 days.

    Can you talk anymore about how to use regedit, along with my different product key, to override (or fake) the start up into accepting my key and running the program?

    I have several keys, but can’t get any of them to work. Once I enter them, the do not validate. I purchased these keys and they should be working. Thanks.

    • Alan September 2, 2012 at 11:10 am #

      Apologies for the delay in replying to this question.

      Sometimes Microsoft blocks keys if they have been used to activate Office too many times – for example a key gets passed around on a forum. For the first few times it will activate, but once it gets blocked it won’t activate.

      If a key won’t activate over the internet, it should be possible to activate it by phone. If you’ve installed Office and activated it on one PC, for example, then take it off in order to install it on another one, it won’t activate over the internet. When you try the phone activation service it will ask “on how many computers has this software been installed?”. If the recorded activation process asks you this kind of question it should be possible to proceed.

      Once a key has been blocked there is nothing much you can do. If you purchased them and they are legal and valid, it’s probably best to take it up with the supplier.

Leave a Reply