People have a tendency to resist change, that's just the way it is. Underscoring this point is the fact that Windows XP is still the most dominant operating system on the desktop despite being released more than a decade ago. Maybe that wouldn't be the case if Microsoft jumped straight to Windows 7 instead of Vista, or perhaps human nature would have proved too strong a force either way. Regardless, XP is sitting pretty on nearly half of all PCs.According to the latest figures from Net Applications, Windows XP's finished off April with a 46.08 percent share of the desktop OS market, down from 55.84 percent one year prior and around 64 percent two years ago, but still well ahead of Windows 7 (38.67 percent), Windows Vista (7.32 percent), and various versions of Mac OS X, with the releases clinging to a 2.71 percent share of the market.For the most part, Windows 7 has been trending upwards and has increased its market share by 12 percentage points in the last year and about 25 percentage points from two years ago. However, it's highly likely Windows XP will still hold the lead by the time Windows 8 ships later this year, and if users don't take kindly to the Metro UI, XP could remain in contention as the most popular OS on the planet for a long while to come.Are you still using Windows XP, or have you since upgraded to something newer?