It is probably because
of your selection of a default printer in Windows. At one time
Word loaded all fonts that were loaded in the operating system
but that slowed down starting Word without much benefit since
most fonts are never used. Now, it loads those fonts that are
recognized by the default printer (still more than most people
use.)
If you change printers for any job in Word, that changes
the default printer in Word for that session of Word. When you restart Word,
the default printer will be the default printer as set in Windows. (There is
an exception to this statement, too, for Word 2000. If, in Word 2000, VBA
resets the active printer, that setting becomes the Windows default upon
leaving Word. This is a bug.)
See . . .
http://word.mvps.org/faqs/formatting/NoFonts.htm
For information on resetting the default font in Word
see that topic.
