problems with shellexecute

[MrBlame]

Hellow.
I need some help in this program i am doing some stuff and i have a little bug in using shellExecuteExecute it works normaly the calculator opens but then the programm that i wrote closes itself and I have onely opened claculator. How to prevent programm from closing?

I launched the debug mode. So when pressed "innstal" again it wrote:
"0x1934 stream exited with code 0 (0x0).
Feed 0x1dc0 exited with code 0 (0x0).
The "[1584] Win32Project3.exe" ended with code 0 (0x0)."
Now I know when i press innstal the program finishes itself and opens calculator again: "why?"

#include <Windows.h>
#include <STDLIB.H>
#include <CommCtrl.h>
#include <math.h>
#include <objbase.h>

#ifndef HINST_THISCOMPONENT
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
#define HINST_THISCOMPONENT ((HINSTANCE)&__ImageBase)
#endif
#define ComboBox 1
#define Exit    1 
#define innstall 2




LPCWSTR g_szClassName = L"MainWindow_Class";
LPCWSTR Text_[] = {L"Choose version"}; 
int textLeng;
 
// GT_HelloWorldWin32.cpp
// compile with: /D_UNICODE /DUNICODE /DWIN32 /D_WINDOWS /c

#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>

// Global variables

// The main window class name.
static TCHAR szWindowClass[] = _T("win32app");

// The string that appears in the application's title bar.
static TCHAR szTitle[] = _T("Win32 Guided Tour Application");

HINSTANCE hInst;

// Forward declarations of functions included in this code module:
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    hInst = hInstance; // Store instance handle in our global variable

    // The parameters to CreateWindow explained:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application does not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application
    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPED | WS_CAPTION | WS_DLGFRAME,
        CW_USEDEFAULT, CW_USEDEFAULT,
        1000, 600,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    // The parameters to ShowWindow explained:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    // Main message loop:
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    TCHAR greeting[] = _T("Hello, World!");

    switch (message)
    {
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);

        // Here your application is laid out.
        // For this introduction, we just print out "Hello, World!"
        // in the top left corner.
        TextOut(hdc,
            5, 5,
            greeting, _tcslen(greeting));
        // End application-specific layout section.

        EndPaint(hWnd, &ps);
        break;
		case WM_CREATE:{
		//comboBox
	 int xpos = 100;            // Horizontal position of the window.
 int ypos = 100;            // Vertical position of the window.
 int nwidth = 200;          // Width of the window
 int nheight = 200;         // Height of the window
 HWND hwndParent = hWnd; // Handle to the parent window

 HWND hWndComboBox = CreateWindow(
	 WC_COMBOBOX, TEXT(""), 
	 CBS_DROPDOWN | CBS_HASSTRINGS | WS_CHILD | WS_OVERLAPPED | WS_VISIBLE,
	 xpos,
	 ypos, 
	 nwidth, 
	 nheight, 
	 hwndParent,
	 NULL, 
	 HINST_THISCOMPONENT,
	 NULL);

  TCHAR Planets[9][15] =  
    {
        TEXT("1.7.9"), TEXT("1.7.10"), TEXT("1.8"), 
        TEXT("1.8.1")
    };
           
    TCHAR A[16]; 
    int  k = 0; 

    memset(&A,0,sizeof(A));       
    for (k = 0; k <= 4; k += 1)
    {
        wcscpy_s(A, sizeof(A)/sizeof(TCHAR),  (TCHAR*)Planets[k]);

        // Add string to combobox.
        SendMessage(hWndComboBox,(UINT) CB_ADDSTRING,(WPARAM) 0,(LPARAM) A); 
    }
      
    // Send the CB_SETCURSEL message to display an initial item 
    //  in the selection field  
    SendMessage(hWndComboBox, CB_SETCURSEL, (WPARAM)3 , (LPARAM)0);


		//comboBox-End

       //Button01
	 LPCWSTR button01_ID = L"Button";
       LPCWSTR button01_text = L"Exit";
       HWND button01 = CreateWindowEx(
		   NULL, 
		   button01_ID,
		   button01_text, 
		   BS_DEFPUSHBUTTON | WS_VISIBLE | WS_BORDER | WS_CHILD,
		   910,
		   0, 70,
		   30,
		   hWnd,
		   (HMENU)Exit,
		   NULL,
		   NULL);
       //Button01-End

	   //button02
	   LPCWSTR button02_ID = L"Button";
       LPCWSTR button02_text = L"innstall";
       HWND button02 = CreateWindowEx(
		   NULL,
		   button02_ID, 
		   button02_text,
		   BS_DEFPUSHBUTTON | WS_VISIBLE | WS_BORDER | WS_CHILD,
		   100, 
		   170, 
		   70,
		   30, hWnd, 
		   (HMENU)innstall,
		   NULL, 
		   NULL);
	   //button02-end
 }
  break;
  case WM_COMMAND:
 {
        switch (wParam){

			 case innstall:{
			LPCWSTR szPath = L"C:\\WINDOWS\\system32\\Calc.exe";


HINSTANCE hRet = ShellExecute(
        hWnd, //Parent window
        L"open",       //Operation to perform
        szPath,       //Path to program
        NULL,         //Parameters
        NULL,         //Default directory
        SW_SHOWDEFAULT);     //How to open
  if((LONG)hRet <= 32)
  {
    MessageBox(HWND_DESKTOP,L"Unable to start setup",L"error",MB_OK | NULL | MB_ICONERROR);
  }
			
         break;                              
						   }
		

     case Exit:{
		 DestroyWindow(hWnd);
		 PostQuitMessage(0);
         break;
			   }   
		}
 }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }

    return 0;
}