I had rebuilt my computer around 2 weeks ago and ever since then I have been having random BSOD daily. They usually happen after the computer has been running from anywhere between 30 mins - 8 hours (usually while playing games but have also happened while just browsing internet) As far as I can remember, every BSOD has been either 'pfn list corrupt' or ' memory management' I have not overclocked anything at all. I have ran both the windows memory diagnostics and memtest and neither have shown any errors. So far I have tried (to no avail) - increasing Ram voltage - switching ram from Dimm slots 1&3 to 2&4 - updated all of my drivers (that I can find/am aware of) System: Windows 7 Ultimate 64bit Intel Core i5-2500k @ 3.30GHz Corsair CMZ8GX3M2A1600C9 8GB 1600MHz CL9 DDR3 Vengeance (2x4GB) Asus GTX560 TI 2GB Graphics card Gigabyte GA-Z68AP-D3 Z68 Motherboard 850W PSU I use microsoft security essentials. The only thing that seems to work (though I haven't tested for longer than about 8-9 hours) is just running with 1 Ram stick. I have attached the dump files. Any help would be greatly appreciated.