Changing Office 2007 CD KEY without Re-install it.

I found the following solution on the Internet. This describes an other error, but it gave me the ability to reenter a new Product Key.

Follow these steps:

  1. Close all Microsoft Office applications.
  2. Click Start, click Run, type regedit in the Open box, and then click OK.
  3. Locate the following registry subkey:

    Note You may also find another subkey that resembles the following subkey:


  4. If you find additional subkeys that reference Microsoft 12.0 registration, open each subkey, and then identify the product by the ProductName entry.
    For example: ProductName=Microsoft Office Professional Plus 2007
  5. When you find the subkey for the product from which you want to remove the existing product license key, delete the following entries:
    • DigitalProductID
    • ProductID
  6. Exit Registry Editor.

The next time that you try to run an Office application, you will be prompted for a new product license key. Then, you can enter the product license key.