Click the size of the desktop wallpaper you would like based on your screen settings. If you're not sure, click through Start > Control Panel > Display > Settings to check your screen resolution. Allow the image to fully load.
Right-click the expanded image and select "Set as Desktop Background"
For Mac:
Click the size of the desktop wallpaper you would like based on your screen settings. If you're not sure, click through System Preferences > Displays to check your screen resolution. Allow the image to fully load.
Right-click the expanded image and select "Use Image as Desktop Picture".