If you have your 25-character key but can’t figure out where to type it, or if the box keeps rejecting it, this guide is for you.
If Office 2010 is already on your computer but is in "Trial" or "Unlicensed" mode: Open any Office program (like or Excel ). Click the File tab in the top-left corner. Select Help from the left-hand sidebar.
: If you are installing from a disc or download, the installer will prompt you for the key before finishing. Spiceworks Community How to Find a Lost Product Key If you cannot find your key, check these common locations: Find your product key for Office 2010 - Microsoft Support
If you installed a trial version of Office 2010 or skipped the key entry during setup, you will eventually see "Product Activation Required" notices. Here is how to enter the key to unlock the full version:
If your computer came with Office pre-installed, you might have a small "Product Key Card" that looks like a credit card with the code printed on the back.