Ok it's my first post here and i hope to contribute to as many posts as i can now that i've joined. I Just recently built a new PC. Here are the Specs: - ASUS M4A79XTD-Evo Motherboard - AMD Phenom II 550 Black Edition - Geil 2 GB RAM 1333Mhz Model #: GV32GB1333C9SC - 500 gb Hard Drive - ATI XFX 4850 GPU 1gb - 460 W PSU Now I buit this computer a month ago and initially i installed windows 7. Then i got rid of it because of countless blue screens and installed windows XP. Same result, same blue screens appearing. At times the PC runs well, but most often than not it just gives blue screens 5 minutes into logging into windows. Here are the BSOD's that i get: - Page Fault in non Paged area - PFN_LIST Corrupt - Some error messages which mention win32k.sys - Some error messages which mention ntfs.sys Do these messages have anything in commum? I've also ran chkdsk at startup and it did all 5 stages, and i believe it deleted a ew corrupted files. But still the BSOD still persists. I set RAM timings in BIOS to it's usual settings, still no success. Interestingly sometimes when i reduce RAM from 1333mhz to 1066mhz it starts up fine... My system is not using cool and quite configuration and NOTHING is overclocked. I've heard of memory leaking, though i don't know what it implies and i've also had some runtime errors. Finally I suspect it either to be the RAM or the HARD DRIVE to be at fault, but i'm no expert and that's why i need your help! So is it hard ware problem or software problem?