Please Help!

I am an idiot. Can someone please help me here. I downloaded a "Earth" desktop image, or something or other, from apple.com It's the one where the globe changes from night to dark based on the time of day that it is. On the center of the screen is says "evaluation use only". I can not figure out how to delete this **** thing. I try to replace it with a new desktop image and in about 5 minutes the earth image re-appears. Can someone please help.

is it possible you have it saved as a screensaver as well?

I thought there was an uninstall with it.

I think that's how i got rid of mine.

I found it. Thanks guys for your help!!