This answer is for a windows xp sysem:
There are two ways to get to the Control Panel dialog for the Start Menu:
1. select the control panel, then select taskbar and start menu control
panel applet, then select "start menu"
2. OR: right click on the start menu and select properties
From the "start menu" tab:
Click on "customize", select the "advanced" tab, and finally, click on the
"clear list" button.
you can find them in the registry:
there you can delete the ones you don't want others to see