C++ Create Simple Window

[onlineone22]

//The first box appears, but then it stops after that. Please help, and thanks in advanced!

#include <iostream>
#include <windows.h>
using namespace std;

const string title = "Diplomacy :: Version 0.01 :: Created by onlineone22";

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    int launch = MessageBox(NULL, "Would you like to launch Diplomacy?", title.c_str(), MB_YESNO);

    if(launch == IDYES)
    {
        CreateWindowEx
        (
            0,
            NULL,
            title.c_str(),
            WS_SYSMENU,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            445,
            445,
            HWND_DESKTOP,
            NULL,
            hInstance,
            NULL
        );
    }

    return 0;
}