Cabu,
I have a laptop with the same video card and I don't have this issue. If it locks up and turning off hardware acceleration "seems" to fix the problem, it is only a sign of your video card (or in this case, rather your video driver) being the problem.
You should try to find a more up-to-date video driver and update your existing one since working with HW acceleration off will definitely slow down your SU especially noticeably with bigger models.