https://purengom.com/2009/10/20/windows-7%ec%9d%98-%eb%af%b8%ec%b9%9c-%ec%97%85%ea%b7%b8%eb%a0%88%ec%9d%b4%eb%93%9c-%ec%a0%95%ec%b1%85-%ec%83%88-pc-%eb%b0%8f-7-%ec%97%85%ea%b7%b8%eb%a0%88%ec%9d%b4%eb%93%9c-%eb%b2%84%ec%a0%84/