There is a sequence of events that you must do in order to reset the add-in. 

Follow the steps below, while in Microsoft Word: 

1. Go to the directory "c:\Program Files\Wasp Barcode\Add-ins\Word\prog" and run wbcuninstall.doc 

2. Open Microsoft Word.  Click  View->Toolbars->Customize and delete any Wasp toolbars that appear.  If no Wasp toolbars are present, continue on with Step 4.

3.  Close Microsoft Word then reopen it.  Click View->Toolbars.  If there are any Wasp toolbars, delete them then Close Word and repeat this step.

4. Go to the directory "c:\Program Files\Wasp Barcode\Add-ins\Word\prog" and run install.doc 

The add-in should now work as expected.

Fontware v4.x+