Update Notice for Windows Creators: Windows.old
Update Notice for Windows Creators: Windows.old
It's possible to remove it without problems too. Using cleanup in admin mode is another option.
Everyone suggested using the Windows Disk Utility with admin privileges to remove the file. This ensures you have a backup in case something goes wrong later. If you're unsure, Windows usually deletes it automatically after 30 days, giving you time to decide whether to revert or not. If everything works fine, you can delete it manually.