LPTSTR lpBuffer;
    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
        NULL,
        GetLastError(),
        LANG_USER_DEFAULT,
//      MAKELANGID(LANG_NEUTRAL, SUBLANG_SYS_DEFAULT),
        (LPTSTR)&lpBuffer,
        0,
        NULL );
    MessageBox(hwnd, lpBuffer, "error message", MB_ICONHAND|MB_OK);
    LocalFree(lpBuffer);