Sargon: According to:
http://www.w3schools.com/browsers/browsers_os.asp As of january 2012:
Win7 - 47.1%
Vista - 4.7%
Win2003 - 0.7%
WinXP - 31.4%
Linux - 4.9%
Mac - 9.0%
Mobile - 1.3%
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Fred_DM: yeah well, maybe we should be looking at data regarding Gaming PCs, not grandma's word processor and office PCs. according to the Steam Hardware Survey over 50% are using W7. only some 19% still use XP. hell, more Steam users use Vista than XP...
Hmm, You do know that at least some gamers don't use Steam at all? Like gamers who hate any form of DRM? Or gamers on dial-up or not having their gaming computer connected to Internet.
This survey is representative only of Steam users who participates in surveys... and I'm betting a significant part are kids playing on newest Grandma's word processor PC when she doesn't use it. A lot of PCs are shared between family members - most of the times the OS is the one that came with the computer.
Most supermarket consumer PCs are not great, but good enough to play. Any PC with decent RAM and recent GPU can play most if not all newest games at max settings, so I don't think the distinction between gaming PC and work PC matters that much.
What is a gaming PC? A PC that can run WoW? A PC that can run GOG catalog and most console emulators? A PC dedicated to newest FPS only? I don't have a clue.
There are still XP users here. It declines, but they won't disappears overnight, as long their computer works good enough. Hey, all newest PC games I bought looks great on my Mac with XP...