Need Xbox Emulator?

So let's say I'm looking for an Xbox emulator, I mean I'm not but...(hello there NSA). But really, I'm looking for a working xbox emulator and preferably either Halo reach or Halo 4. Does anyone know of a website that doesn't have those survey things that make me want to punch monitor that I can download either of those from? Thanks! Mod Edit - Personal Information Removed. Use PMs