Computer Tips

Delete Windows.old folder using Disk Cleanup
Open Disk Cleanup Tool and select Files from all users on this computer. Click the Disk Cleanup tab, and then look for the Temporary Windows installations check box.
 Select Previous Windows installations. click OK. This will remove the Windows.old folder.

Remove Windows.old folder using Command Prompt
Alternatively, you can also use a command prompt to delete files and folders from an earlier installation of Windows. To do this, Run ‘Command Prompt’ as administrator.

First you will need to take ownership of this folder, so at the command prompt, type

takeown /F C:\Windows.old\* /R /A
and hit Enter.

Next, in the command prompt, type

cacls C:\Windows.old\*.* /T /grant administrators:F
 and hit Enter. When you run this command, administrators are granted full rights to all files and to all folders.

Finally, type

rmdir /S /Q C:\Windows.old\
and hit Enter. This will delete the windows.old folder.

Author: Hamedledam