Brother MFC 620CN - Color Inkjet - All-in-One Network User's Manual page 55

In addition to this you also need to manually remove the Brother
Internet Fax Driver from the printers list.
To do this select Start | Printers and Faxes you are then presented
with the Window illustrated below.
Right click the Brother Internet Fax, from the list click Delete.
Accept the confirmation and the driver will be deleted.
7 - 8 BROTHER INTERNET FAX PRINTING SOFTWARE