I am pretty sure it must be due to Windows Update (or some hidden auto driver update)
I have been playing sleeping dogs / diablo3 / GW2 / LoL happily,
but since last night, it suddenly freezes or BSOD
i didn't upgrade video driver (GTX560Ti nVidia) since 2.9xx,
when seeing the BSOD, so upgrade the nVidia right away to 3.06.02... no luck
latest nVidia crashes some Windows Update??
all games crashed / freezed / BSOD now...