Many of you would have faced this problem with Microsoft Xbox 360 wireless controller for PC where you cannot switch/power off the controller other than removing the battery bay each time when you want to power off.
The problem is no more. Download this small application for Microsoft Windows, Xbox 360 Controller Manager with which you can power off the wireless Xbox 360 controller with the long press of the Guide button at the center of the controller. Long press of the Guide button will popup the following message.
The size of the application is only 343KB and the credits for the software goes to the developers.
Download Link : Xbox 360 Controller Manager