You can still create PDFs by printing to the Adobe printer (in the Print
dialog), but I believe if you reinstall Acrobat the add-in will be
recreated.
FYI, I have Word 2002 and when I installed the full version of Acrobat
5 I noticed that there was no PDF icon in Word. I think that I simply
forgot to install the Word addin (probably buried in the custom
install options)
Which frankly isn't actually necessary... because you can just print
to the Distiller driver (and use the print dialog box to choose the
Distiller joboption you want to use).