Windows XP is gone and Microsoft will not provide updates or security patches for it anymore, but still it is 2nd most popular OS according to the comparison on statcounter (with 16.89% of total OS users from around the globe).
Plenty of companies and banks were using Windows XP and Microsoft gave them sufficient time to upgrade their operating systems and even PCs if they had to. Still after end of its (Windows XP) support it is among the lists of operating systems being used by majority of users right now.
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Also according to the comparison shown in above image Windows 7 is most popular at this time with 50.3% of total OS users from all around the world.