Arrrrgh C++ help

// test2.cpp : Defines the entry point for the console application.
//

#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <stdout.h>
#include <stdio.h>
#include <iostream.h>
#include "stdafx.h"

using namespace std;

int main()
{
    INPUT* x;
   //x=new struct tagINPUT;
   //printf(sizeof(struct tagINPUT));
   printf("hello");
   return 0;
}

The piece of coe above keeps complaining INPUT is an undefined identifier - even though it is defined in winuser.h (pulled in with windows.h). Any ideas why it's not working appreciated.