this tutorial will show you the steps you need to do to start windows 7 side bar according to microsoft Windows Sidebar is a long, vertical bar that is displayed on the side of your desktop. It contains mini-programs called gadgets, which offer information at a glance and provide easy access to frequently used tools. For example, you can use gadgets to display a picture slide show, view continuously updated headlines, or look up contacts

To open Sidebar
Open Windows Sidebar by clicking the Start button Picture of the Start button, clicking All Programs, clicking Accessories, and then clicking "Windows Sidebar".

i tried that but i am missing "Windows Sidebar"

so this is how i did it

right click on your desktop and select gadgets
22p-3419-win7-select-gadget.gif

double click on whatever icon you want to add, then the gadget will appear on the right side of your desktop which the icon of the gadget
22p-3419-win7-sidebar-settings.jpg