Use the disk cleaning function
Right-click drive C- click Properties-click Disk Cleanup-select files to delete-click OK.
Kingsoft Internet Security C Disk Slimming Function
Open Kingsoft Internet Security, click the treasure chest on the home page, and find the slimming function of disk C-click the slimming function of disk C in the left column, scan the file, select the file to be released, and slim down with one button.
Clean up the wechat chat record of disk C.
In the lower left corner of WeChat, find Settings-General Settings-File Management-Find the location where the file is stored, and you can "clear the chat history" or change the location of the file, preferably not on the C drive.