Help with thread............

hello everybody, please i need your help,
I try to work with thread in c++ , in easiest application work Ok but in
application with thread the class doesn't ....the application show an
critical error that said
"has been a critical error and must be shoutdown ".
the code is:
DWORD WINAPI Controller::ExecuteThread(PVOID data)
{
Controller* pt = (Controller*)data;
pt->objNavigator = Navigator(pt->currentInstitution, pt->currentMode,
pt->visibility, pt->Timeout);
pt->objNavigator.Execute();
Sleep(1000);
return 0;
}
void Controller::LoadNavigators(int Mode, int user)
{
HANDLE thread_handle; // this is the handle to the thread
DWORD thread_id;
for(int i=0; i<Controller::_Institutions.size(); i++)
{
Controller::currentInstitution = Controller::_Institutions[i];
Controller::currentMode = Mode;
thread_handle = CreateThread(NULL, 0,&Controller::ExecuteThread ,this, 0,
&thread_id); // HERE ERROR
Controller::putResults(Controller::objNavigator.Ge tResults());
Controller::_ServicesToExecute = _ServicesToExecute +
Controller::_Institutions[i].getCountServices();
}
}

Please hellppppppppp me
:O(