Hi JPL,
To create a barcode you need a barcode font. Google barcode font free 3 of 9 extended to choose a free downloadable font.
If you want to be able to read the barcode via a barcode scanner/reader, then you must enclose the characters between two asterisks *. For example, if the barcode is to be 123456, you would enter *123456* Highlight this code and apply the barcode font to it. You can enter the characters again below the barcode itself without the asterisks in a non-barcoded font.
Example
*123456* (in barcode font)
123456 (in Arial or some other non-barcoded font)
Apparently Word may adjust your character spacing causing the barcode to be unreadable, and it is recommended by some to use Wordpad instead. I have successfully created barcodes in Crystal, Access, and Excel without incidence.
Hope this helps,
Lori