%temp% is a system environment variable, corresponding to the folder C: \ documents and settings \ administrator \ local settings \ temp. Running %temp% will open this folder. Temporary files left over from software installation and other work are useless junk files and can be deleted completely.

Click Start-Run in the lower left corner and enter "%temp%" (enclosed in quotation marks). Click "OK", and the junk files of drive C will appear, and then select all to delete. (will not affect the system)

If you can't delete them all, delete them one by one (smash them). I still can't delete it. Leave it alone for the time being.

Disk cleaning method.

Click "Start → Run" and enter "cleanmgr /SAGERUN:99" in "Run". At this point, the system will execute the "special mode" of the disk cleaning tool. After entering, you can quickly cclean files, and several dialog boxes will pop up in turn.

If you want to clean selectively, enter "cleanmgr /sageset:99" in the run dialog box and press Enter. There will be many cleaning options, and you can choose the files to clean.

Method for run cookies command.

Open the start in the lower left corner of the computer, enter the operation, enter cookies, and click OK. Delete all the files in the box.

Cleaning cookies can also protect your privacy and prevent leaks. But you should pay attention to this method: the information you left on the website will be cleared.

Check the event viewer method.

Starting at eight o'clock, find the control panel. After opening it, find "Performance and Maintenance" and "Administrative Tools" and find the Event Viewer. Double-click the left key to open it, put the mouse on the application in the dialog box, see how many events you have, and remove the useless ones. Then drag the mouse down to the system to see how many useless events are left in your system, and clear them according to the above method.