For those who have a Xbox 360 Wireless Controller For Windows, I found a way of turning off the controller. Well, if you don't have it you may think that it has a turn off/on button right? Nope, it doesn't. Unless you play a "Games For Windows Live" game, you won't be able to turn off your controller, giving you 2 options: Taking off the batteries(seriously, don't do that) or waiting 10 minutes( good bye batteries). I'm giving you the third one.
1- Download this: pety.me/XboxExt/index.php?download
2- Double-Click and check if you see an icon on system tray(or whatever these icons near the clock are called in english).
3- If you want to turn it off, hold the Xbox Center Button until a pop up appears.
4- Press A button. If you accidentally pressed, press B button.
I hope I helped someone.