After a few months using Windows, Installer and Winsxs folders in C driver become bigger and over control. To save your hard disk or SSD, please follow steps to move Installer folder to other driver: Backup permission on Installer folder:  Command:  icacls C:\Windows\Installer /save Installer.acl  Backup and delete content Installer folder  select all files and folders in Installer folder  cut  paste to destination (ex: E:\C_Windows\Installer)  Copy file Installer.acl to the destination and run to set permission:  Command:  icacls E:\C_Windows\ /restore Installer.acl  Type the following commands in a cmd.exe window running as Administrator:  Command: rmdir /s /q C:\Windows\Installer  Command:  mklink /D C:\Windows\Installer E:\C_Windows\Installer