C:/windows/Installer是一个和C:/windows/winSxS同样可怕的文件夹，在我的固态硬盘上，它的体积达到了10GB，然而都是些没有什么卵用的安装文件。因此可以使用链接的方式把它挪到HDD里。

• Make sure no installations are running on your machine (there’s probably a formal way to do this, but I’m not sure how).
• Copy using Windows explorer C:\Windows\Installer to another disk, e.g., D:\C_DRIVE\Windows\Installer – note: Windows\Installer is a system folder and thus invisible in Windows 8.1. You have to tweak your account to make it visible to use Explorer to make the copy. Google will help you find out how to do that.
• Make a backup copy of C:\Windows\Installer
• Type the following commands in a cmd.exe window running as Administrator:
rmdir /s /q C:\Windows\Installer
mklink /D C:\Windows\Installer D:\C_DRIVE\Windows\Installer


• 确认在你的电脑上没有正在安装的软件（似乎不会有什么影响）
rmdir /s /q C:\Windows\Installer