So far I have used Windows XP, Windows Vista and Windows 7. I have never had any problems with XP, it's so hassle-free to use. With Vista, I actually had to turn off the automatic updates feature because it downloaded screwed up updates, like it changed the theme and layout of my pc to that ancient Windows '98 look, and I can't change it anymore. So I un-installed that particular update, and after doing that, my original theme and layout returned. So I have stopped updating it after that incident. Now I use Windows 7, and I don't like that they have removed the "move" option and now, if we want to move files, we have to drag that file to our desired location. And in my case, it just copies the file, and the original copy remains in the same location. I don't like that they have removed the "move" option. So how about you? Which is your favorite or preferred Microsoft OS and why?