Reply To: Delete' Windows.old' folder using powershell
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A few amendments to Topaz’s answer. use ‘start-process‘ cmdlet to start ‘cleanmgr.exe‘.
If(Test-Path -Path($((Get-WmiObject Win32_OperatingSystem).SystemDrive) +"\windows.old")){ New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Previous Installations" -Name "StateFlags1221" -PropertyType DWORD -Value 2 -Force | Out-Null Start-Process -FilePath "cleanmgr" -ArgumentList /SAGERUN:1221 -Wait -WindowStyle Hidden}