Windows 98 and System Tray

Good Day,
I have a Windows 98 workstation that is losing icons from the System Tray. I loaded a new program and in order to configure it I’m required to right-click the icon in the Systen Tray. When I reboot the system, there is no icon to be found. I’ve loaded the same program on other 98 and 2000 workstations and had no problem. I’ve also noticed that an icon from a label printing program has disappeared. Would anyone know why this might happen and how to fix it?
Thank you,
G. Hamilton