Win XP home on my laptop. System Tray shows active icons correctly but the lbutton in the shape of the little circle with the arrow head in its centre is missing. I can therefore not show inactive icons. The icons that do show are sometimes intermittent eg "Remove Hardware safely" virtually never shows but does occasionally. Even the missing button come on about once a month. I have tried Increasing the size of the taskbar and restoring it, selecting a lower colour resolution, locking the taskbar. I have even disabled all startup items so that nothing shows. Still no arrow button. Any help appreciated.