Excel 2000, format changes from users
 

In using Excel 2000, I made a big spreadsheet with specific font formatting
and many sheets.

When finished, i put the file on a network drive (I work for a company).
Another user accessed the file, but the font was changed, pictures moved, and
so on.

The user also has Excel 2000, and also has the font installed.

How can I fix it so the user can access the file as it was made?