Hi, I was wondering anybody can help me with this BSOD I have been having. I already reinstalled windows 7 in hope that this problem goes away. However, my efforts were futile. I have just purchased a new desktop and my friends helped me build it from scratch. At the initial days, the computer on windows 7 professional operated with no problem. However after a couple of days, when i start the pc in the morning, the computer crashes with error 1a just a couple min after I successfully log into my account. This problem occurred 2-3 times as a restart before calming down and becomes fine. In response to this error, I have run memtest for both memory sticks, and individual stick. However, the memory sticks passed all 3 runs respectively. As my friend suggested that I run verifier.exe, the computer crashes right after I restart and the screen "start windows". Can anybody give me any suggestions on how I might approach this problem? Thank you for your time.