I'd just like to interject for moment. What you're refering to as Windows, is in fact, NT/Windows, or as I've recently taken to calling it, NT plus Windows. Windows is not an operating system unto itself, but rather another component of a fully functioning NT system made broken by Microsoft bloatware, CMD utilities and vital system components comprising a broken OS as defined by almost all users.
Many computer users run a modified version of the NT system every day, without realizing it. Through a peculiar turn of events, the version of NT which is widely used today is often called Windows, and many of its users are not aware that it is basically the NT system, developed by the greedy Microsoft Corporation.
There really is a Windows, and these people are using it, but it is just a part of the system they use. Windows is desktop environment: the program in the system that the user interacts with, and launches the programs that you run. Windows is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Windows is normally used in combination with the NT operating system: the whole system is basically NT with Windows added, or NT/Windows. All the so-called Windows versions are really versions of NT/Windows!