How to Delete the Windows.old Folder

If you want to know how to delete the windows.old or windows folder which is not needed then you've come to the right place. You don't need to search any more for a method.

Procedure:

Here we will take C:\Windows.old as an example,

First you will need to run command prompt as administrator. Click on start button and in the search box type cmd.exe. After the search you will see cmd in the results, right click on it and click run as administrator.

After that 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. As simple as that :)

Source TWC