Click the Tools Folder option on the menu bar, uncheck "Hide Protected System Files" in the view bar, and then select "Show All Files and Folders". At this time, if you look at the windows directory of drive C, there may be many folders starting with the "$" symbol, which may be blue (provided that your drive C is in NTFS format) and you can delete them all.

C:\WINDOWS\Installer directory may have a hidden folder beginning with $,so you can delete it all.

After stopping the windows automatic update service, you can delete all the contents in the C: \ Windows \ Software distribution directory.

Finally, you can use our usual system cleaning software to come to cclean. At this time, there should not be so many. Finally, you search all. Log files under drive C, it is possible that you have those installation logs after installation, and some of them are also very large, such as sql server or Oralce.