A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
You'll have to re-run Office's SETUP program from the original CD or wherever else you have it stored, but it'll be quick and simple.
When you run it, it'll detect that Office is already installed and offer you the option of ... hmm ... I forget how it's worded but basically, you'll be able to add/remove any Office components you like w/o changing anything else.
Locate the Graph option, set it to Run from my computer; make no other changes (unless you want to add/remove something else while you're at it, of course) and let the install finish.
Probably won't take you more than five minutes start to finish.