Xbox 360 Emulator?

Hello there. I've been trying to find a working Xbox 360 emulator so that I could run the 360 version of Sonic Unleashed on my gaming computer. When I looked, I found 3 emulators, but they didn't seem too trustworthy. The first two asked me to apply for a password, which didn't even work, and the third asked me to do a survey, which I didn't trust, either. Here's a list of them:
Xbox 360 Emulator
Xbox360Emu (may be the same thing)
Xbox360EmulatorX
(The reason I didn't provide links was because it wouldn't let me.)
I'd really like some help with getting this to work. I know that many people say it just can't be done, but the 360 is about 7 to 8 years old, and we've already achieved Wii emulation in that time.