STOP: c000021a (Fatal System Error). The Windows Logon
Process System process terminated unexpectedly with a
status of 0xc00000080 (0x0000000 0x00000000). The system
has been shut down
Not the same i guess , as my bsod was some minutes after the logon(If i remember well
Lets see if they can tell us the reason of the bsod
But it was very stranger
All normal and so a bsod happens in a recently formated*With no diferent programs ad machine
in case of BSODs always upload the minidump(s) to ftp.avast.com/incoming
compress them into archive and try use somewhat unique filename (your nick and date and some number for example)