@stephen24, please do us a favor, not trying to troll, however it is very hard to understand your questions, as for emulation of xbox 360 or playstation 3, currently it isnt possible, as for downloading games, unless they are free to play, is also known as pirating or stealing, and is illegal, we cant help you if you are stealing games, however, you can buy most all games here
http://store.steampowered.com/
This is like xbox live marketplace or playstation store, you can buy pc games here