Vista comes with some default gadgets for the Windows Sidebar, including clock, calendar, contacts, currency, feed headlines, cpu meter, weather, stocks, notes, slide show and picture puzzle. If you accidentally delete one of the default gadgets and you’re wishing you had it back, follow this Tech-Recipe.
1. Right-click the sidebar, and select Properties.
2. When the Windows Sidebar Properties window appears, go to the Maintenance section and click the Restore gadgets installed with Windows button.
3. Click the OK button.