The toolbars that are included in XP's Internet Explorer can be switched on
or off by opening an IE window. Then click on View> Toolbars. Toolbars with
a check next to them should be displayed. Click any toolbar to add or
remove the check.
That toggles the "kiosk" mode, also known as full-screen mode. Note that
full-screen is not the same as Maximized, which is not the same as a Normal
window stretched to fill the screen.