You need to "register" or "activate" the giveaway program - usually by running the Activate.exe program that is included with the download file. When you activate the software - those prompts won't appear.

Unfortunately, as that giveaway has finished, it is now too late to activate the program.

I downloaded the 3D moon screensaver yesterday & now everytime it comes up it prompts me to register the product or purchase the product.
How do I get rid of this??