ps. Debug data from the minidumps now posted in 3 following posts, plz help! My PC - AMD 4000+ San Diego DFI Expert 2GB RAM, 2 sticks of 1GB each (OCZ4002048ELDCPE-K at default timings of 2-3-2-5) Geforce 6600GT Coolmax CXI-500B 500W SLI I've recently formatted and reinstalled Win XP x64 on my new PC on partition 1 and have Win XP x86 on partition 2. All drivers on Win XP x64 are WHQL ones only. I've ran memtest atleast 3-4 times for 10-18hrs each time with no errors showing up. I don't have any programs installed on my pc except for winrar , winamp & irfan view. Also I've installed the latest fixes for XP x64 (service pack 1). Thats all. I got BSOD the first time when i just tried to boot into Win X64, the 2nd time again it happened when i tried to boot into it and the 3rd time it happened when i tried to shut it down. (I get BSODs in Win XP 32bit version as well, but first i want to figure out the probs with the 64bit ones here). I've attached the dump files in the zipfile here, with the dump files being named after the order of their crashes (ie. 1, 2 & 3). Please check them and let me know whats causing these random BSODs. Your help will be greatly appreciated. Thanks.