Easy enough...
Windows 2000: Right-click on the task bar (NOT the start menu), select "properties", and UNCHECK "Use personalized menus" or some such.
Windows XP: Right click on the start button, select Properties, uncheck "Use custom menus."
I think it's the same for 98SE and ME, but I could be wrong.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche