i have a very good system: windows 7 ultimate 64 bit. 6 gb ddr3 ram, asus p6t deluxe v2 motherboard, coolermaster, ati radeon hd 5870 3.8 gb. However, it freezes up and programs do not respond sometimes for no reason. For example, just earlier, i was copying some files while typing in microsoft word 2007. It froze, and i opened task manager, it later unfroze but was kinda laggy. However, task manager showed no spikes in cpu usage or anything what is the problem?