Internet savvy people please?

What are these sites always displaying on every site i go to? offering free games like mario or pac-man or some sort? here they are: mightymagoo.com playsushi.com playpickle.com retroogames.com And NO,Mario was Not "game of the year" check it out This is NOT Altered in ANY way!:http://imageshack.us/f/543/supermriov407.jpg/ Can you solve my problem? is it an virus? because when i try to play,it will start downloading an setup file that i dont want to save because of possible viruses.Help Please