Cue the predictable tired old rants of slashbots who haven't figured out that it isn't 1997 anymore. They don't get much more penguin-headed than me, and I'm typing this message on a computer running Windows. Guess what, people: WE WON. Linux runs the whole world except for the conventional desktop. Look at it this way: if Microsoft hasn't taken over the rest of the world by now, it's not going to. At the same time, if Linux hasn't captured the conventional desktop by now, it's not going to. In other words, it's safe to use a Windows desktop now if it's less friction for you. You don't have to be ashamed, you don't have to be afraid that you're contributing to the downfall of computing. Linux owns 100% of supercomputing, the lion's share of the cloud and mobile, it runs the Internet, it's the embedded OS of choice, and it dominates the IoT. Don't worry about the desktop -- it simply isn't important anymore.
That having been said, I'm not sure why one would want to run Windows on a Raspberry Pi, since as others have pointed out, it fails to provide the #1 benefit of running Windows: the vast library of x86 Windows software.