https://purengom.com/2010/07/15/windows-update-%eb%95%8c%eb%ac%b8%ec%97%90-%ec%bb%b4%ed%93%a8%ed%84%b0%ea%b0%80-%ec%9b%90%ed%95%98%ec%a7%80-%ec%95%8a%ea%b2%8c-%ec%9e%ac%eb%b6%80%ed%8c%85-%eb%90%98%eb%8a%94-%ea%b2%bd%ec%9a%b0/