When you upgrade from Windows 7 or Windows 8.1 to Windows 10, OS retains a copy of your old operating system just in case if you want to revert (restore) to the previous version. However, if you decide that you are happy running Windows 10 and don’t want to roll back, you are left with 10GB+ wasted space of your C drive the folder hogging up that memory is named Windows.old. You can not delete Windows.old from File Explorer. Here is How to remove Windows.old Folder in Windows 10 properly.
How to Delete Windows.old Folder from Windows 10 Step by Step
Removing Windows.old Folder from Windows
Step 1: Search for Disk Cleanup from on Windows Search
Step 2: Click on “Clean up system files“, Wait a bit while Windows scans for files.
Step 3: Once files are scanned scroll until you find “Previous Windows installation(s).” Check the Box and Click “OK”.
Step 4: Confirm the next Popup by Clicking on “Delete Files“.
That’s It and you’re done removing Windows.old Folder from Windows 10. If you face any problem during the process let me know in comments below.