1, open "My Computer" (this computer), enter the hard disk and find drive C.
2. Right-click Drive C-in the pop-up menu, select Properties.
3. Select Disk Cleanup. At this time it will scan and wait patiently for a few minutes.
4. After scanning, select "Clean System Files" and the system will be scanned, and then wait patiently for a few minutes.
5. After scanning is completed, in the pop-up window, find "Previous windows Installation", check the front of this item, and then confirm the cleaning.
6. The waiting time for this step may be longer. Depending on the size of the backup file, the time will be different. Please wait patiently again. After the prompt is completed, enter the C drive again and you will find WINDOWS. The old file is missing or has become 0KB.