If you did not install the PowerPoint Menu Add-in, there is secondary route for adding a Vivant instance:
Under the ``Insert'' menu, click ``Instance.'' If the ``Object'' entry is not there, the ``Insert'' menu should be expandable via an arrow at the bottom. Click the arrow to show all options.
Click ``Object''. This will bring up a dialog with a list containing various insertable objects in alphabetical order.
Select ``Vivant class''. It should be listed near the bottom.