Click on your desktop resolution to download the compressed zipped jpg image. Select a destination on your computer for the file and then unzip it (if your computer doesn't recognise the Zip format, you can download WinZip from this location.)

Unzip the file and place it in a location you will remember. Right Click on your windows desktop, select Properties and then Desktop. Use the Browse button to locate the image, double click on it and then select Apply and OK.