Sendto feature not working properly

I tried to add a shortcut in my sendto list that appears when you right click on a file or folder. It worked fine the first time. But when I rebooted my machine, that folder shortcut which i added has vanished. The four default menu items (compressed zip, desktop, mail recipient, My documents and 3 1\2 floppy) are still there.. What could be the problem? I do not have admin privileges. Can anybody think of a solution?