For users who have been using for a long time, C disk will accumulate some spare data, taking up too much space, for the need to delete it is not necessary: delete the free file, Freeing up space can make our computer faster and waste resources. Deleting those is good 1. Open "My Computer" - "Tools" - "Folder Options" - "View" - check the "Show all files and folders" option - "OK" 2. Delete the following folders Content: All files under x:\\Documents and Settings\\username\\Cookies\\ (retain index file) x:\\Documents and Settings\\username\\Local Settings\\Temp\\ all files (user temporary files) x :\\Documents and Settings\\username\\LocalSettings\\TemporaryInternet Files\\All files (page files) x:\\Documents and Settings\\username\\Local Settings\\History\\ under all files (history) x:\\Documents and All files under Settings\\username\\Recent\\ (shortcuts for recently browsed files) All files under x:\\WINDOWS\\Temp\\ (temporary files) x:\\WINDOWS\\ServicePackFiles (upgrade files after upgrading sp1 or sp2) The compressed file under x:\\WINDOWS\\Driver Cache\\i386 (the backup file of the driver) All files under x:\\WINDOWS\\SoftwareDistribution\\download 3. If you have upgraded the system by windoes updade, delete the following files: x: \\windows \\Under hidden files starting with $u... 4. Then defragment the disk, please quit all running programs during the finishing process. 5. Open the "Start" - "Programs" - "Accessories" - " System Tools - "System Restore" - "Create a Restore Point" (preferably with the current date as the name of the restore point) 6. Open "My Computer" - right click on the system disk - "Properties" - "Disk Cleanup" - "Other Options" - Click "Clean" in the System Restore column - select "Yes" - ok 7. After various software and hardware are installed properly, XP will rarely need to update the files. Delete the system backup file: Start → Run → sfc.exe /purgecache nearly 3xxM. (The function of this command is to immediately clear the "Windows File Protection" file cache and release the space it occupies.) 8. Delete the dll file under \\windows\\system32\\dllcache (minus 200-300mb), this is the backup. The dll file, as long as you have copied the installation file, you can do so. 9, XP will automatically back up the hardware driver, but after the hardware driver is installed correctly, the possibility of hardware changes is not great, so you can also consider deleting this backup, the file is located in the \\windows\\driver cache\\i386 directory. The name is driver.cab, you can delete it directly, usually this file is 74M. 1 0, delete the unused input method: For many users, the input method of Windows XPt system is not all suitable for their own use, such as IMJP8_1 Japanese input method, IMKR6_1 Korean input method, if you do not need , we can remove it. The input method is located in the \\windows\\ime\\ folder, which takes up 88M of space. 11, the upgrade is completed, found windows\\ many more like $NtUninstallQ311889$ these directories, all kill it, 1x-3xM 12, in addition, retaining the \\windows\\help directory is a kind of harm to me, huh, huh. . . Do it all! 1 3, turn off the system restore: the system restore function takes a long time, it will take up a lot of hard disk space. Therefore, it is necessary to manually set it to reduce the amount of hard disk usage. Open the System Properties dialog, select the System Restore option, and select the Turn off system restore on all drives check box to turn off System Restore. You can also set restores only on the disk or partition where the system is located. First select the partition where the system is located, click the "Configure" button, in the pop-up dialog box, cancel the "Close the system restore of this drive" option, and set the amount of disk space for system restore. 14, the hibernation function will take up a lot of hard disk space, if you use less, you can close it, the way to close is: open the "Control Panel", double-click "Power Options", in the pop-up "Power Options Properties" dialog box Select the "Hibernate" tab and uncheck the "Enable hibernation" checkbox. 15. Uninstalling Unused Components: XP installs some system components to the operating system by default, and a large part of these components are completely impossible to use. You can uninstall them in "Add/Remove Windows Components". But some of the components XP are hidden by default. They can't be found in "Add/Remove Windows Components". You can do this by opening the file \\windows\\inf\\sysoc.inf with Notepad and using Find/Replace. The function replaces all the "hide" characters in the file with null. In this way, the hidden attributes of all components are removed. After saving and exiting the "Add-Remove Programs", you will see a lot of options that you could not see, and delete those components that you can't use. (Remember to save as sysoc.inf when saving, instead of the default sysoc.txt), such as Internat messenger service, fax service, Windows messenger, code table, etc., about vacating nearly 50MB of space. 16. Clear system temporary files: Temporary files of the system are generally stored in two locations: the Temp folder in a Windows installation directory; the other is x:\\Documents and Settings\\"username"\\Local Settings\\Temp folder (Y: is the partition where the system is located). Files in both locations can be deleted directly. 17. Clear Temporary Internet Files: Regularly delete a large number of temporary Internet files generated during Internet access, which will save a lot of hard disk space. Open Internet Explorer, select "Internet Options" from the "Tools" menu, select the "General" tab in the pop-up dialog box, click the "Delete Files" button in the "Temporary Internet Files" column, and pop up " In the Delete File dialog box, select the "Delete all offline content" check box and click the "OK" button. 18, clear pre-read files: Windows XP pre-read settings can improve the system speed, but after a period of use, the number of files in the pre-read folder will become quite large, resulting in longer system search time. Moreover, some applications generate dead link files, which further burdens the system search. Therefore, these read-ahead files should be deleted periodically. It is expected that the files will be stored in the Prefetch folder of the Windows XP system folder, and all files under this folder can be deleted. 19, compressed NTFS drive, file or folder: If your hard disk is using NTFS file system, the space is really tight, you can also consider enabling NTFS compression. Right-click the drive you want to compress - "Properties" - "General" - "Compress Disk to save disk space", then click "OK", select the desired option in "Confirm Property Changes". This saves about 20% of your hard drive space. When compressing the C drive, it is best to compress it in safe mode, which is better. 20, close Dr. Watson Dr. Watson: To close Dr. Watson, open the registry editor, find the "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\WindowsNT\\CurrentVersion\\AeDebug" branch, double-click the Auto key name under it, and set its value The data is changed to 0, and finally press F5 to refresh the settings, thus canceling its operation. Also enter "drwtsn32" command in "Start"->"Run", or "Start"->"Program"->"Accessories"->"System Tools"- >"System Information"->"Tools"->"Dr Watson", call out Dr. Watson in the system