My KDE taskbar and desktop have disappeared

[Ashley Moran]

(Doubt this first bit is relevant but it's what happened...)  This morning, I 
started up my desktop with the monitors off, so it came up in 640x480 or 
something useless.

I rebooted and logged into KDE and got an error message saying "Taskbar applet 
cannot be started".  I logged out and logged back in.  This time it was 
silent but I still have no taskbar or desktop.

Does anyone know what I can do to fix this, or where the error is logged so I 
can work out what's up?

Cheers
Ashley