Delete Windows.old folder from Windows 10
How to delete the Windows.old folder on your computer
1. In the Start menu search box, type "cleanup" and then click "Disk Cleanup" in the results.
2. If you see the Drive Selection dialog box, make sure that the C: drive is selected, and click "OK."
3. Click "Clean up system files."
4. You may need to choose drive C: a second time and click "OK." Then you'll need to wait while the program scans your drive.
5. Select the checkbox for "Previous Windows installations" from the list of files to delete.
6. Click "OK."
