I have a ECS K7S5A mobo w/ 256k DDR memory running win2k. All of a sudden it freezes. It has been running well for about 6 months. Nothing that I can remember has been added or change. I returned the memory and it ran fine for a month or so, the again it froze. I moved the memory to another slot. Is it possible that the memory slot may not be perfect?? What da ya think?