Desktop Earth - You should run it as admin.
Earth 3D Live Wallpaper - Earth 3D Live Wallpaper helps you capture the beauty of mother earth.
EarthView - Free Cloud Data Download
Xplanet - Xplanet is free software, distributed according to the terms of the GNU General Public License.
TerraTime - TerraTime provides an amazing, interactive, real-time virtual Earth.
Earth Live Wallpaper - Earth Live Wallpaper helps you view the earth with magnificent detail and is a great substitute for your plain desktop wallpaper.