I'm new here so give me a break if this has been answered a thousand times already. I built a computer in July last year. The major specs are, AMD Athlon X2 4400+, Asus A8N-SLI Deluxe mobo, GeForce 6800 GPU, 2 Gigs of Crucial Memory, 180gig Western Digital HD. The problem is that it randomly freezes when doing different operations. Sometimes I will be playing a game, other times I will just be surfing the internet and it just stops. The HD LED stays on continuously and the system stops responding, no mouse movement, keyboard functions. Recently, I turned my computer off and started it up getting a BSOD saying a SAM file is corrupt (I think I may have been hacked for that one). I have run memtest for about 1 day straight, with no errors. I have replaced the Hard Drive which doesn't seem to be the problem. Any ideas on how to figure out what is causing the random crashes? Thanks for your help.