When I right-click on any of the icons on the Quick Launch Toolbar, I get the usual menu:
Scan with AVG
Left-Clicking on any of these options works as it is supposed to.
However, if I right-click on any of the QL Toobar icons a second time, the Taskbar menu appears, preceded by
Open folder (this opens the Quick Launch Toolbar folder)
Tile Windows Horizontally
Tile Windows Vertically
Show the Desktop
Lock the Taskbar
and, crucially, left-clicking on any of the icons has no effect.
(Broadly speaking, the same happens with the Desktop toolbar.)
I have already established, with the help of Katana on http://forums.spybot.info/showthread.php?t=29717 that I do not have any malware. You can see that thread to look at the various logs produced.
At her suggestion, I used http://www.kellys-korner-xp.com/taskbarplus!.htm - the Taskbar / "Toolbars greyed out or missing" option restores icons' left click function by restarting the Windows Shell.
I am running Windows XP Professional SP3 (but another laptop on the network running SP2 has the same problem.)
Edited by Big_John, 02 July 2008 - 04:26 PM.