Beware the ides of Marchus, or Septemberus, as it might be.
Basically windows 8/8.1 haven't won anyone over, and windows xp is dying by attrition as people replace their PCs and get stuck with the new Windows.
No one is willing to pay for the upgrade to windows 8/8.1.
Anyone with windows 7 is hanging on for dear life ......
Good luck, Microsoft, with your next OS.