Box Characters in Word

Believe it or not I still have a client using office 97. I also know this forum is dedicated to Office 2000 and better. If anyone out there has the answer it is simply appreciated. When my client opens a Word document across his network some of the text shows as box characters… only on some of the workstations. I realize the most common reason for this is an absence of the proper font file on the local machine. But I’ve standardized all of the font files on all of the workstations. I’vealso checked version… the item is saved in the most updated version for Office 97. I cannot figure out why only some workstation… I cannot find the difference, the one setting, toggle or omission that is causing this on the affected machines.