Singleton class fails on reboot

Hi,

I am writing a windows service. The code runs fine when I start the
service when my machine is running but
it fails to start automatically when the machine reboots. The code
bombs out when it reaches code that tries to access
a singleton class. This is the code.

void ClientLogging::initClientErrorLog(InstallationInfo install)
{

  // next line fails on a reboot
  string szLogLevel =
ConfigManager::Instance().getConfigMgrValue("LOG_LEVEL");

  Logging::Instance().Initialize("IseeCltLog");

  Logging::LogLevel severity =
Logging::Instance().toSeverity(szLogLevel);

  m_pFileLogAppender = new FileLogAppender(severity, logFile); //this
line fails on reboot
  if(false == Logging::Instance().addAppender(m_pFileLogAppender))
  {

  }

}

The strange thing is ClientLogging is also a singleton, the first one
that is called, and this works fine.
This is called using:

ClientLogging::Instance().initClientErrorLog(install);

But it is inside this that the problems arise, on the line as seen
above

string szLogLevel =
ConfigManager::Instance().getConfigMgrValue("LOG_LEVEL");

The code just terminates.

Is there anything I can do to prevent this, any pragma.
Could this be because I initialize static variables.

Your help would be greatly appreciated.

Enda