hi ! I have been searching lately how to solve my BSOD problem that started to happen two weeks ago and I found this forum most appropriate for that. My BSOD, as I said, started to happened two weeks ago. First BSOD happened while I was playing world of tanks, and I thought problem is in the game. After a few days BSOD happened while I was surfing on net and that alarmed me. Anyway, meanwhile I have constant, random BSOD. sometimes after a 6-7 hours, sometimes after a 5-6 minutes after starting my PC. I did some PC maintenance, formated HDD and installed a new copy of WIN7, but BSOD still happens and reports two bad files, ntoskrnl.exe and hal.dll, even after and before windows reinsall. I cleaned my PC, all fans, reassembled and cleaned all components. I bought a new graphic cars ati 6790 memtest86 reports no errors prime95 no errors diskcheck no errors temperatures are OK, psu is Gigabyte - 750 watts pc compnents : MB: m2n sli deluxe CPU: amd phenom II 9950 RAM: 4 gb ddr 2 800 mhz GC: ati 6790 not overclocked, bios setup is default. thanks for any help !