PFN_LIST_CORRUPT (4e) Typically caused by drivers passing bad memory descriptor lists (ie: calling MmUnlockPages twice with the same list, etc). If a kernel debugger is available get the stack trace. Arguments: Arg1: 0000008f, The free or zeroed page listhead is corrupt Arg2: 0000c09f, new page Arg3: ffffffff, old page Arg4: 00000000, 0 I've got an Intel P4 Prescott. I have an aftermarket heatsink and fan rated for the prescott. An ASUS P4P800SE. American Megatrends bios ver. 080009. I had 4 256mb sticks of DDR. I thought it may have been a bad stick of RAM (although i ran memtest86 for 13 passes and got no errors) so i replaced it with 1 1gb stick of DDR. I had a NIC that was kinda acting up, sporadically would stop working, so i've replaced that. I've formatted and reinstalled a few times now. This is a fresh install of WinXP Pro sp3. Let me know if you guys need anymore information. Any help you can give me would be great. Thanks!