Happy New Year and I want to say thanks in advance to everybody for running these forums. I have been getting a consistent but fairly intermittent BSOD. It usually happens no more than once a week sometimes only once a month or less. The bug check string is always PFN_LIST_CORRUPT and the bug check code is always 0x0000004e and it always complains (according to bluescreenview) about ntoskrnl.exe. Any information I have been able to find about this through Google seems to point to a rather generic memory issue - either a bad memory module, a driver issue or possibly a hard disk issue. The crash usually happens when I am playing Bad Company 2 but it has happened while just leaving the computer sitting idle and doing nothing a few times as well. I have run memtest86+ with each individual stick of ram as well as with all of the ram (4 sticks of 2gb memory) installed overnight with no errors. I have run a full virus scan with MS Security Essentials and it came back with no errors. I ran sfc /scannow and it did not come back with any errors. I ran Driver Verifier with all drivers selected and I did not get it to crash. However the network adapter would not operate correctly I'm not sure if that is indicative of anything. I also ran 3dmark without it crashing as well. I have to admit I'm not entirely sure I was using verifier correctly as I have never used it before. I updated my BIOS, did a clean install of my video driver and updated as many other drivers as I could although according to the driver list that is output from the SF Diagnostic Tool it does look like I have some older drivers on my system but I am unsure how to find and update these specific drivers. Here are the specs from my machine: Custom home built machine - I know, that's probably the issue right there!! LOL =) I am not overclocking Windows 7 64 bit Antec 300 case Mushkin 650 watt PSU Gigabyte GA-P55-UD3L (Revision 1.0 with the P55 Chipset) Core i5 750 8GB Patriot PC1333Mhz Dual Channel Ram (PSD34G1333k) Linksys WMP54G wireless G PCI network adapter ASUS DRW-24B1ST Optical Drive Western Digital Blue Caviar 500GB Drive EVGA GTX 460 Screenshots from CPU-Z are posted below and a zip file with the contents of the output from the SF Diagnostic Tool are attached. Thanks in advance for any help that anyone has to offer.