This error is considered "catastrophic" because it is an error that the program is not able to recover from. One has to look for additional information since this error simply indicates that the application will terminate since it is no able to continue.
Symbolic name: E_UNEXPECTED
M973558 describes a situation when this occurs because the backup process (Windows Vista Backup) detects that system drive is dirty.
M940184 shows that a corrupt registry entry may also cause this.
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