Windows 2012 - How to remove Windows.old folder

If you upgraded your server to Windows 2012/R2 you will see c:\windows.old folder.

To remove it correctly you must add Disk Cleanup utility with this powershell command:

Add-WindowsFeature Desktop-Experience

It will appear Clean up system Files button, after that you will be prompted to remove windows.old or precedents windows installations.

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How to install Clean up utility on windows 2012 

Windows.old problem]