获取当前系统版本（4）

 if (WINDOWS_SYSTEM_VER_VISTA32 == version)
 {
  CString strBuildLabEx;
  dwBufSize = MAX_PATH;
  if (ERROR_SUCCESS != RegQueryValueEx(hKey, SYSTEM_BUILD_LAB_EX_VAR, NULL, NULL,
   (UCHAR*)strBuildLabEx.GetBuffer(MAX_PATH), &dwBufSize))
  {
   RegCloseKey(hKey);
   strBuildLabEx.ReleaseBuffer();
   return FALSE;
  }
  strBuildLabEx.ReleaseBuffer();
  if (strBuildLabEx.Find("x86") == -1)
  {
   version = WINDOWS_SYSTEM_VER_VISTA64;
  }
 }
 RegCloseKey(hKey);
 return TRUE;
} 此最后代码可能与具体应用不相关，可参考使用