Some friends of mine have a problem with their computer, and I have been unable to look at it. However I have discussed it with them at length, and wondered if anyone else had encountered it:
They had an old moniter that was on its way out, the usual gradual dimming of display. Recently when they shwitched it on it also had shadowing running from left to right from icons and text. This only appears after windows has started, the text as it is booting is fine. They went out and brought a new monitor, but the problem remains. The settings are all within the limits of the graphics card and the monitor. Could it be an error with the graphics card? I assume the computer is fairly old, since they brought the first monitor with it and they usualy last a few years.