Refer to the following: 1. Turn off system restore: My computer properties/system restore/turn off system restore on all disks, but I can't use system restore in the future! 2. Turn off system hibernation: before starting system hibernation, uncheck control panel/power supply/hibernation /3. Move virtual memory, my computer properties/advanced/performance/settings/advanced/change/select drive C, which is also a system disk, and then set virtual memory to its disk. Disks with large disk space, such as disks D, E and F, should be set as memory. 5. Clear IE temporary folder, Internet option, delete temporary files and offline files 6. Delete system log and program log, My Computer/Control Panel/Administrative Tools/Computer Management/Event Viewer/Application, right click/clear all events, and then clear system log7 in turn. Clear the system cache: 2000 system is: C:\ WINNT \ system32 \ dllcache XP system is: C:\windows\system32\dllcache system clears the system cache (open the My Computer/Tools/Files and Folders option/hide the protected system files by selecting the check box to show all files). You can also run the sfc.exe/Purge cache command directly to delete it automatically. 8. Empty the recycle bin 9. Delete the files under C: \ Windows \ Software Distribution \ Download (the downloaded files will be useless if the system is updated) 10. Delete all directories under c: \ Windows \ Registered packages11. Delete all files under the program files downloaded by WINDOWS \ are 12. The My Computer folder option views hidden files that are known to be protected by the system, checks them out, and checks all files for confirmation. Delete c:\windows\ all files with $ (backup file after system update) 13. Clean up C disk garbage and registry garbage with optimization master (optimization master is relatively safe, just delete all scanned files! ) 14. Infected with viruses (worms) will constantly copy junk files, occupying a lot of system disk space, leading to system paralysis. It is recommended to use mainstream antivirus software to upgrade to the latest virus database for killing.