I am a regular subscriber for many years and I have got shut down problem. When I turn off the computer it shuts abruptly and then a blue screen comes with this caption " Stop: c000021a (Fatal System error). The Windows Logon Process System process terminated unexpectedly with a status o. The System has been shut down."
On restarting computer after all loaded a window of Winlogon.exe appears saying winlogon.exe encountered a problem and wanted to close down.