Windows 2000 incorporates personalized menus as its default. The most recently
used and the most often used menu items are displayed. Items that you do not use
very often are hidden beneath an arrow. I like it. It eliminates clutter from
stuff you are not using anyway. If you don't like it, if you feel that it hides
things or confuses you, turn it off.
To control the option, click on Start / Settings / Taskbar
and Start Menu... / General Tab and check or uncheck the Use Personalized Menus check box.