Hi everyone, I've been grappling with this problem for quite some time now, and I'm at the end of my tether. Basically I've been having random spontaneous restarts of my system, and I just can't seem to work out what's causing them. At first they seemed to be isolated to when I was playing games, but it seems now it's happening in Windows as well. Anyway, first thing I did was turn off automatic restart, but unfortunately in the game causing the most problems (World of Warcraft) the BSODs were unreadable. Last night however, a BSOD occurred while I was just browsing, labelled BAD_POOL_HEADER. I suspected that my RAM was maybe faulty, so I ran the memtest86+ floppy disk test, it ran successfully for 5 hours without any errors. I just dunno what to do anymore, whether to blame hardware or software. These are my specs: Windows XP Pro (SP2) AMD Athlon XP 1800+ (1.53 GHz) MSI MS-6734 Mainboard (VIA KM400 chipset) 768 MB DDR RAM in 2 slots (512 and a 256) Sapphire Atlantis Radeon 9600 Pro (Catalyst 5.5) Onboard AC-97 sound (VIA vinyl v600a drivers) DirectX 9.0c I've attached the last few minidumps, as well as an up to date DXdiag output file. All help is appreciated.