Word cannot be found on the machine

I am getting this strange error when I try to import a Word file into LiveCycle Designer CS: Word (XP or higher) cannot be found on the machine. I am running LiveCycle Designer CS on a Dell Inspiron with Windows Vista (yuck) and Office 2007. Has anyone else gotten this message? Is there a known solution? BTW I do have Word installed, and I can open the file I'm trying to import in Word.