It's possible that some other software that was installed after Word
replaced that DLL with an older version.
Try running the Help > Detect and Repair function in Word, and have the
Office CD handy in case it's needed. Another way to do the same thing is to
open the Add/Remove Programs control panel, select Word or Office (whichever
appears there), and click the Change button, then select Repair in the setup
dialog. Either way, the installer should recognize the version mismatch and
restore the DLL that came with Word.
Microsoft Word MVP FAQ: http://www.yqcomputer.com/