http://www.techradar.com/news/windows-10-will-overtake-windows-7-before-2017-is-out

According to numbers from one analyst firm, Windows 10 is set to overtake Windows 7 before the end of the year, in terms of the amount of PCs these operating systems are installed on across the world.

The latest figures from Statcounter (based on its own website analytics) show that, as of September 2017, Windows 10 is installed on 39.3% of desktop Windows PCs, and Windows 7 is now only just ahead at 43.99%.