1. You can delete all hidden files that start and end with $.

This kind of file is generally an uninstall program left by upgrading the system, which takes up a lot of space and is useless, so deleting it will not have any impact on the system. However, these files are hidden files, so to find them, you must turn on the display of hidden files in folder options → View.

A large number of documents under 2.2. Administrator file

As a user under the Windows system, many temporary files can be deleted directly, without worrying that the system will crash. Most of these files are located under Documents and Settings \ Administrator. Specifically, there are all files except the last index under S; All files under local settings \ Temp All files under temporary internet files are set locally; All files under local settings \ history; All the recent documents.

3.3 Files in other folders. Windows operating system

In addition to the first two categories, many upgrade backup files and driver backup files can be deleted, which exist in all files (temporary files) under Windows Temp. Windows Service PackFiles (backup files after upgrading sp 1 or sp2); Compressed files under WindowsDriver Cachei386 (backup files of drivers); Download all files under the Windows software distribution.

These files will be continuously generated as users use them.