How do I get useful error information from the Event Log?

Be sure the following keys are in your registry:

  [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
       Services\EventLog\System\WinRT] 

  "EventMessageFile"="%SystemRoot%\\System32\\ 
  IoLogMsg.dll;%SystemRoot%\\System32\\drivers\\winrt.sys" 

  "TypesSupported"=dword:00000007