If you are printing inventory labels and are not seeing the barcode, you may not have the correct font installed.
1. The barcode font can be downloaded from the below URL.
https://squaregear.net/fonts/free3of9.html
2. Right click on the downloaded zipped file and select 'Extract All' to unzip.
3. You can then go to Control Panel > Appearance and Personalization > Fonts and drag and drop the font in here to install.