@wawrzon
My system worked fine with windows xp 32-bit so I doubt that it's a hardware issue. I find that the graphics drivers, in particular, are not as stable. Going into hibernation mode also fails at least 50% of the time, and even standby mode is risky since it's not guaranteed to come out of it. Finding 64-bit drivers is a real pain, and they're often not as stable as their 32-bit counterparts.
Hans