Remove Windows.old folder in Windows 8 / 7
First you will need to take ownership of this folder, so at the command prompt, type
and hit Enter.takeown /F C:\Windows.old\* /R /A
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
and hit Enter. This will delete the windows.old folder.rmdir /S /Q C:\Windows.old\
