WINDOWS XP PRO CONTROL PANEL

IN WINDOWS XP PRO CONTROL PANEL CLICKING ON THE DISPLAY ICON CAUSES THE ICON AND TEXT TO CHANGE COLOUR AND THE POINTER TO CHANGE TO AN HOURGLASS BUT THE DISPLAY PROPERTIES PANEL DOES NOT APPEAR.
ALSO RIGHT CLICKING ON THE TASKBAR AND SELECTING “TOOLBARS” BRINGS UP A GRAYED-OUT MENU.
BOTH THE ABOVE MAY HAVE BEEN CAUSED BY THE OVER-ENTHUSIASTIC USE OF A REGISTRY CLEANING PROGRAM.
ANY HELP WOULD BE MUCH APPRECIATED.