Once again we approach the release for the next generation of consoles, the Xbox One (November 22, 2013) and Playstation 4 (November 15, 2013). This means that just like last time with Xbox 360 and PS3, more than 7 years ago, there will be several sites that claim that they have emulators that allow you to run games. You should not believe that.
Trust only sites that you know (such as us!) and be sure that if such an emulator is released you will know about it first hand. Do not fall for scams aimed to trick you into installing a fake program that could very well include viruses.
Ps: Be wary of PS3 and xbox 360 as well, there are many fake sites and even videos on youtube claiming of such emulators. An example of a working PS3 emulator is RPCS3 which is able to run some simple homebrew games.