Thread: 0xC0000005: Access Violation

I keep running in Access Violations while running through the DirectX 8 Init functions. Here is an example where I receive an 0xC0000005: Access Violation. Any one have an idea of what may be the cause?

Code:

// directinput globals
LPDIRECTINPUT8       lpdi      = NULL;    // dinput object
LPDIRECTINPUTDEVICE8 lpdikey   = NULL;    // dinput keyboard

int DInput_Init_Keyboard(void)
{
	// this function initializes the keyboard device

	// create the keyboard device  
        // get 0xC0000005: Access Violation here 
	if (lpdi->CreateDevice(GUID_SysKeyboard, 
			&lpdikey, 
			NULL) != DI_OK)
	{
		return(0);
	}

	// set cooperation level
	if (lpdikey->SetCooperativeLevel(main_window_handle, 
				DISCL_NONEXCLUSIVE | 
				DISCL_BACKGROUND) != DI_OK)
	{
		return(0);
	}

	// set data format
	if (lpdikey->SetDataFormat(&c_dfDIKeyboard)!=DI_OK)
		return(0);

	// acquire the keyboard
	if (lpdikey->Acquire()!=DI_OK)
		return(0);

	// return success
	return(1);
} // end DInput_Init_Keyboard

Thanks,
David