Sounds like bad ram to me. Also, Funny enough, there is no point in having a system like that lastwish if you don't have a powerfull enough power supply. A 350 watt PSU just don't cut it anymore, I went out and bought a new other the other day, a 400 Watt, it's really nice, everything runs smooth again. No Crashing or anything. When i would play americas army, my whole system would hang, now, it doesn't!