Received this error on a W2k3 SP2 Std Server.
Checked all event logs at the time it happened, and nothing seemed to have provoked it.
-- From the Event log: Error code 00000044, parameter1 8788fe48, parameter2 00001c13, parameter3 00000000, parameter4 00000000.
-- The reason supplied by user *REMOVED*\Administrator for the last unexpected shutdown of
this computer is: System Failure: Stop error
Reason Code: 0x805000f
Bugcheck String: 0x00000044 (0x8788fe48, 0x00001c13, 0x00000000, 0x00000000)
Comment: 0x00000044 (0x8788fe48, 0x00001c13, 0x00000000, 0x00000000)
Possibly a related issue is that backup jobs with arcserve have started to fail too, the job that was meant to run didn't. Although these would usually finish way before this STOP error came.