在安装VS 2005 SP1过程中，很多人经常遇到一个错误而不能继续安装。下面是微软给出的解决办法，原因是补丁文件太大，解决办是为这个补丁安装一个补丁，详情都在这个链接页面上：
FIX: Error message when you try to install a large Windows Installer package or a large Windows Installer patch package in Windows Server 2003 or in Windows XP: "Error 1718. File was rejected by digital signature policy"
FIX: Error message when you try to install a large Windows Installer package or a large Windows Installer patch package in Windows Server 2003 or in Windows XP: "Error 1718. File was rejected by digital signature policy"
