I don't have Windows 8 to test myself, but you can say that there is a high possibility of issue if the user has a graphics card that's a few years back (before 2011) with Windows 8. Your users would need to install their cards' Windows 7 drivers under Windows 8 in a specific manner.
http://www.lockergnome.com/windows/2012/09/29/make-your-old-graphics-drivers-work-in-windows-8/
http://www.minecraftforum.net/topic/1264610-windows-8-opengl/
You should always have up-to-date drivers, in any case. I don't think Windows 7 should be a major concern, as according to that first link it is Windows 8 and above, having updated its display driver from 1.1 to 1.2, that produces most of these errors.
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