If you're using Mac OS X:
1. Quit Word
2. Follow the path Applications > Microsoft Office X > Office > Startup > Word
3. Find the file called PDFMaker.dot
4. Drag it to Trash
5. Stamp the dirt down
... of course microsoft are the masters at forcing useless features down our throats, but this one from adobe is especially annoying.
good luck if you're trying to do this in windows
I've had it with Adobe Acrobat's forcing their toolbars down my throat. They get in the way of all my Office applications and no matter how many times I remove them, they all come back.
I finally found one PDF reference in my Application Data file under Microsoft Office and removed it. Now it doesn't appear in Word. But no matter what I do, it still shows up in Outlook.
What's with Adobe's pigheaded attitude of forcing this stuff down users' throats? When you customize an application, you ought to be able to turn off annoying "features." If someone could tell me how to rid myself of this lingering annoyance, I'd be obliged.