[Topaz George]

Hope this helps.

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 
	cleanmgr /SAGERUN:1221 
}