1. Turn off system restore (never used) and hibernate.

2. Delete the contents of the folder C:\Windows\System32\Dllcache.

3. Delete invalid folders with numerical numbers, such as the root directory FOUND.000 of drive C (if any).

4. Delete all *. Log files in the system directory.

5. Search all *. $,*.~, *.~ *, *.bak*，chklist。 *, *.chk，*。 ftg，*。 fts，*。 gid，*。 Old, *. prv，*。 err，errorlog.txt，*。 . Nch, Thumbs.db files, and delete them (you can write a bat file to run).

6. Delete all *. Tmp file under C:\Windows.

7. C: \ Windows \ Downloaded Program Files only keeps flash and auto-update plug-ins.

8. Delete the contents of the folder C:\Windows\Driver Cache (make a backup and put it on another disk, and you can call some drivers later).

9. Enter the help folder and delete all files (unused, basically can't understand Microsoft's help).

10. Delete the contents of the folder C:\Windows\Prefetch (before disabling startup read-ahead).

1 1. Delete the contents of the folder C:\Windows\Temp.

12. Delete the contents of the folder C:\Windows\Web\WallPaper.

13. Delete the unnecessary theme files determined under C:\Windows\Resources\Themes (I only keep luna and the classic theme I redefined-Luna cannot be deleted in normal mode, but needs to be in safe mode).

14, the system's own input method is not deleted, and sometimes others will use it.

15. Delete fonts that are not commonly used under C:\Windows\Fonts (Arial, Verdan, Tahoma, Times New Roman, Song Ti, Bold, etc.). ). Don't delete it, or the Chinese characters in the program or webpage will be abnormal. At the same time, the deleted part will be backed up to other disks for backup).

16. Delete the numbered folder under C:\WINDOWS\system32 (keep 1033 and 2052).

17. Delete *. Unused ime files under C:\WINDOWS\system32 (for example, the uninstaller of Ziguang Pinyin Green Edition is not very good, so you can't delete this file. If you don't use it, you need to delete it manually).

18. Delete all *. Scr file without screen protection (flashy, it is said to be harmful to LCD).

19. Delete all *. Chm file and all *. Hlp file. Don't look for help, these are all rubbish.

20. delete the folder c: \ documents and settings \ user name \ local settings \ temp.

2 1. delete all items under c: \ documents and settings \ user name \ local settings \ history.

22. delete all the items under c: \ documents and settings \ user name \ local settings \ temporary internet files (I have moved to disk d, so this operation is not needed).

23. delete the IconCache.db file under c: \ documents and settings \ user name \ local settings \ application data (the icon cache file takes up a lot of space, and the system will generate it automatically anyway).

24. delete the contents in the directory c: \ documents and settings \ all users \ application data \ Kaspersky lab \ avp6 \ report (report file, if not needed, the original file will be automatically generated by starting Kabbah anyway).

25. Delete three hidden folders (uninstall information, InstallShield installation information and WindowsUpdate) under C:\Program Files.

26. delete all files under c: \ program files \ windows media player \ skins (classic skin is the most beautiful and smooth).

27. Delete the hidden folder starting with $ under C:\Windows (files left after patch update).

28. set the virtual memory to other partitions, restart, and delete the pagefile.sys file in the root directory of disk C. ..

29. Clear the log files generated by the system and some directories that will be automatically generated when the application software is started (many of these, such as adobe and office, need to be handled with caution, otherwise it will be too big to delete the files needed by the system).

30. Clear IE's form records, historical records, temporary files and cookies (if you need to back up existing cookies, you can export them to other disks in advance and import them back after ghost).

3 1, know all the schemes under C:\WINDOWS\Cursors (the system is too ugly for you, put it in your favorite ChaNinjia scheme).

32. If you don't need sound, you can delete the content of C:\WINDOWS\Media. I'll keep it for now.

33. Clear the contents in the directory C: \ Windows \ Software Distribution \ Download (backup of installation file for patch update).

34. Clean up all the junk files left in the system directory of the tried application software (this takes a lot of effort).

35. Clean up the residual information list and operation records of all the tried application software in the registry (it seems that the current rabbits and optimization masters are not smart enough, so they have to delete them manually).

In short, the principle of simplification is: according to your own personal needs, completely determine the useless deletion, the ambiguous best retention, and the system key files are absolutely unchanged.