Guys! I'm facing this problem since some days. Before today, many times when i start my system, and windows start, it automatically restart when Login Screen was about to come, i.e., It restart before the login screen. But today, my windows restart automatically after the complete login, i.e., the desktop was running and it restarted automatically. What may be the reason? I hv checked by reinstalling the windows, but problem exists. And it happens not always but sometimes. PS: A startup entry called KernelFaultCheck = "%systemroot%\system32\dumprep 0 -k" is automatically added in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. And today I saw a strange icon a triangle with ! inside, when i clicked on it or double-clicked on it, it disappeared and again displayed after a few secs.