Add Take Ownership to Context Menu:

Windows Registry Editor Version 5.00

[-HKEY_CLASSES_ROOT\*\shell\TakeOwnership]
[-HKEY_CLASSES_ROOT\*\shell\runas]

[HKEY_CLASSES_ROOT\*\shell\TakeOwnership]
@="Take Ownership"
"Extended"=-
"HasLUAShield"=""
"NoWorkingDirectory"=""
"NeverDefault"=""

[HKEY_CLASSES_ROOT\*\shell\TakeOwnership\command]
@="powershell -windowstyle hidden -command \"Start-Process cmd -ArgumentList '/c takeown /f \\\"%1\\\" && icacls \\\"%1\\\" /grant *S-1-3-4:F /t /c /l' -Verb runAs\""
"IsolatedCommand"= "powershell -windowstyle hidden -command \"Start-Process cmd -ArgumentList '/c takeown /f \\\"%1\\\" && icacls \\\"%1\\\" /grant *S-1-3-4:F /t /c /l' -Verb runAs\""

[HKEY_CLASSES_ROOT\Directory\shell\TakeOwnership]
@="Take Ownership"
"AppliesTo"="NOT (System.ItemPathDisplay:=\"C:\\Users\" OR System.ItemPathDisplay:=\"C:\\ProgramData\" OR System.ItemPathDisplay:=\"C:\\Windows\" OR System.ItemPathDisplay:=\"C:\\Windows\\System32\" OR System.ItemPathDisplay:=\"C:\\Program Files\" OR System.ItemPathDisplay:=\"C:\\Program Files (x86)\")"
"Extended"=-
"HasLUAShield"=""
"NoWorkingDirectory"=""
"Position"="middle"

[HKEY_CLASSES_ROOT\Directory\shell\TakeOwnership\command]
@="powershell -windowstyle hidden -command \"$Y = ($null | choice).Substring(1,1); Start-Process cmd -ArgumentList ('/c takeown /f \\\"%1\\\" /r /d ' + $Y + ' && icacls \\\"%1\\\" /grant *S-1-3-4:F /t /c /l /q') -Verb runAs\""
"IsolatedCommand"="powershell -windowstyle hidden -command \"$Y = ($null | choice).Substring(1,1); Start-Process cmd -ArgumentList ('/c takeown /f \\\"%1\\\" /r /d ' + $Y + ' && icacls \\\"%1\\\" /grant *S-1-3-4:F /t /c /l /q') -Verb runAs\""

[HKEY_CLASSES_ROOT\Drive\shell\runas]
@="Take Ownership"
"Extended"=-
"HasLUAShield"=""
"NoWorkingDirectory"=""
"Position"="middle"
"AppliesTo"="NOT (System.ItemPathDisplay:=\"C:\\\")"

[HKEY_CLASSES_ROOT\Drive\shell\runas\command]
@="cmd.exe /c takeown /f \"%1\\\" /r /d y && icacls \"%1\\\" /grant *S-1-3-4:F /t /c"
"IsolatedCommand"="cmd.exe /c takeown /f \"%1\\\" /r /d y && icacls \"%1\\\" /grant *S-1-3-4:F /t /c"

Take ownership of C:\Windows.old and delete the folder and all files and subfolders:

# Ensure we're running with administrator privileges
if (-NOT ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator"))  
{  
    Write-Warning "Please run this script as an Administrator!"
    Exit
}

$windowsOldPath = "C:\Windows.old"

# Function to take ownership and delete a file
function Take-OwnershipAndDelete($path) {
    try {
        # Take ownership
        takeown /F $path /A /R | Out-Null
        
        # Set full control for administrators
        icacls $path /grant administrators:F /T /C /Q | Out-Null
        
        # Delete the file or directory
        if (Test-Path -Path $path -PathType Container) {
            Remove-Item -Path $path -Force -Recurse
        } else {
            Remove-Item -Path $path -Force
        }
        
        Write-Host "Deleted: $path"
    }
    catch {
        Write-Warning "Failed to process: $path"
        Write-Warning $_.Exception.Message
    }
}

# Process all files and directories
Get-ChildItem -Path $windowsOldPath -Recurse -Force | ForEach-Object {
    Take-OwnershipAndDelete $_.FullName
}

# Finally, remove the Windows.old directory itself
Take-OwnershipAndDelete $windowsOldPath

Write-Host "Operation completed."

takeown /F "C:\Windows.old" /A /R /D Y

rd /s /q "C:\Windows.old"

icacls "C:\Windows.old" /setowner "Administrators" /T /C