2. Select drive C, right-click the shortcut menu, and then select "Properties" to open the properties window. ?
3. In the properties window that opens, select Disk Cleanup to open the Disk Cleanup window. ?
4. In the Disk Cleanup window, click Cleanup System Files. ?
5. When opening a new window, drag the scroll bar, find the "previous Windows installation file", click the check box in front of it, and select this item. Click OK to open the dialog box "Are you sure you want to permanently delete these files?" Click Delete File. When the dialog box pops up again, click Yes. ?
6. Wait for the file to be deleted automatically, and then you can use the computer normally. Delete after graduation. Looking at drive C, the available capacity will increase.