Use 360 security guards. Open the 360 security guard, which contains "one-click cleaning", "cleaning garbage", "cleaning plug-ins", "cleaning traces", "cleaning registry" and "finding large files", which can clean up more than 60% of the junk files in the computer system.

Manually delete useless files in drive C, especially large files. First, find the folders such as "TDDownload, Download, KwDownloadx, Media, Downloads, 360Download" in the computer and delete them directly. It can clear more than 20% useless files in the computer system.