To install with Windows:
Check your screen resolution from Start/Settings/Control Panel/Screen/Settings/Screen Area
From this page choose the subject with resolution that best matches the monitor characteristics.
Click on the calendar format or selected background and save (right mouse button – save image with name) the file in the Documents directory (or a temporary folder)
From Start/Settings/Control Panel/Screen/Background/(scroll in the window)/select the name of the chosen file, click on apply and then on OK

As an alternative to point 3, for those with Explorer, it’s also possible to click normally on the selected resolution and, the next time the image is displayed, click using the right mouse button and select 'Set as background'. The selected image will be inserted immediately on the desktop background and point 4 is no longer required.