Sidebar is one of the notable additions in Vista. By default the sidebar contains a Calendar, Clock and slide show of pictures. Gadgets can be added or removed from the sidebar. Frankly speaking, the sidebar is of not much use actually and the sidebar starts up with Vista. You can disable the sidebar if you feel that sidebar is of no use.
1. Right click on Sidebar and in the option select Close Sidebar,
2. Right click on sidebar and select properties in the options.
In the properties options, uncheck “Start Sidebar when Windows Starts” option. Next time when Windows starts, sidebar will not be loaded.
3. Right click on the sidebar icon on the taskbar and select Exit.
Apart from these, you can change the start up of sidebar in msconfig file.