I use Vista so have a look at the image below of my own Desktop and Start Menu;
You can see my Start menu has the Lock button.
I've made no changes so I am unsure why yours is not there by default.
Hello and thanks if you can help
Though Vista is not in everyone favor, I did miss some of the features that I commonly used. One of them was the lock button next to the shutdown button. Is there a way, hack, software, etc, to return the lock button? Also, the option to have three power plans when clicking the mini power management window on the task bar. Is there a way to return it to three instead of two?