XP installs BT into "ApplicationData" folder because its a "system" folder. System folder entries are shared with other software programs, within the Application Data area. That's why is works in conjunction with your browsers. Software in the "Programs" area dont interact with other programs in the "programs" area. As far as a blank icon, I've never had that happen with BT, but I've had it happen with other icons and its a taskbar issue. Sometimes a reboot fixes, other times I would check then uncheck the "hide icons" in taskbar properties to get the icon to come back.