Hook souris et Windows 7 64 bits

HWND hwnd;
DWORD ProcID;
HANDLE hProc;
BOOL bWOW64Proc = FALSE;

GetWindowThreadProcessId(hwnd, &ProcID);
hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, ProcID);
IsWow64Process(hProc, &bWOW64Proc);
CloseHandle(hProc);

#include <windows.h>
#include <stdio.h>

HANDLE MemPartagee;
HINSTANCE thismod;
HHOOK hhk;

/**
 * Init DLL.
 */
extern "C" __declspec(dllexport) BOOL WINAPI DllMain(HINSTANCE hDll, DWORD dwReason, LPVOID Reserved)
{
    if(dwReason == DLL_PROCESS_ATTACH)
    {
        thismod = hDll;
    }
    return 1;
}

/**
 * Fonction hook.
 */
LRESULT CALLBACK wndProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    if (nCode >= 0)
    {
        if (wParam == WM_LBUTTONDOWN)
        {
            // Traitements du hook ...
        }
    }
    
    return CallNextHookEx(hhk, nCode, wParam, lParam);
}

/**
 * Démarrage du hook.
 */
extern "C" __declspec(dllexport) int __stdcall Intercepte()
{
    if(!hhk)
    {
        hhk  = SetWindowsHookEx(WH_MOUSE, wndProc, thismod, 0);
    }
    
    return (int) hhk;
}

/**
 * Arrêt du hook.
 */
extern "C" __declspec(dllexport) void __stdcall Relache()
{
    if(hhk)
    {
        UnhookWindowsHookEx(hhk);
        hhk = 0;
    }
}

#define _WIN32_WINNT 0x0400
#include <windows.h>

HHOOK hHook;    // Handle du hook global
HINSTANCE hExe; // Handle de notre exécutable

// Fonction de gestion du hook 
__declspec(dllexport) LRESULT CALLBACK HookProc ( int nCode,  WPARAM wParam,  LPARAM lParam) 
{
    if  ((nCode >= 0) && (wParam == WM_LBUTTONDOWN))
    {
        MessageBox(NULL, "clic !", "Clic", MB_ICONINFORMATION);
    }
    
    return CallNextHookEx(hHook, nCode, wParam, lParam);
}

// Fonction principale.
int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmd, int nShow )
{
    hExe = GetModuleHandle(NULL);
    hHook  = SetWindowsHookEx(WH_MOUSE_LL, (HOOKPROC) HookProc, hExe, 0);
    
    while(!(GetAsyncKeyState(VK_F8)))
    {
	Sleep(500);
    }
    
    UnhookWindowsHookEx(hHook);
    
    return 0;
}