This is the list of stuff that separates Windows from Everyone Else. And by separates, we mean is missing.
Microsoft is in an awkward position with Windows. Because it's got such a huge share of the market, in order to appease the anti-trust people, it can't be complete. Honestly, it's a very stripped-down operating system. Nobody really worries about reinstalling OS X or most flavors of Linux because they come with all the applications built in, double standards notwithstanding. And people cringe when they realize it's time to install Windows again, because they know there's just a million things they're going to have to pick up, download, rather, before they can ever begin to relax with a little Hulu-based Stewart. And I don't mean things like Shockwave Flash, I mean the whole list of utilities and applications you install over the course of the year or so of computing since that last clean install. It's no wonder people delight in playing with other operating systems. Everything's there, installed, ready to go. 'Course, the grass is always greener, and soon enough, you've got to get Windows back on something so that you can get your Wine-free gaming on or, like, camera working.