I forgot where I read it, but from Microsoft's analytics it was found that majority of crashes were result of a driver bug (often) in the Graphics stack which w

I forgot where I read it, but from Microsoft's analytics it was found that majority of crashes were result of a driver bug (often) in the Graphics stack which was a decision driver for them to move the graphics stack into the userspace. The drivers still do have a kernel mode component but it is much smaller than it was in the XP days and the results show how (relatively) stable things have gotten since.