Besitzer von RegKey ändern, wenn man keinen Zugriff hat + nicht der Besitzer ist

function Take-RegKeyOwnerShip {
    param(
        [Parameter(Mandatory=$true)][string][ValidateSet('CurrentUser','LocalMachine','ClassesRoot','CurrentConfig ','Users')]$root,  
        [string]$key,
        [System.Security.Principal.SecurityIdentifier]$sid = 'S-1-5-32-544',  
        [bool]$recurse = $true
    )

    # Adjust Privilege Tokens
    $nttools = Add-Type -Member '[DllImport("ntdll.dll")] public static extern int RtlAdjustPrivilege(ulong a, bool b, bool c, ref bool d);' -Name nttools -PassThru  
    9,17,18 | %{$nttools::RtlAdjustPrivilege($_, 1, 0, [ref]0) | out-null}

    # recurse function
    $adjustkey = {
        param($root, $key, $sid, $recurse, $level = 0)

        # set ownership
        $regKey = [Microsoft.Win32.Registry]::$root.OpenSubKey($key, 'ReadWriteSubTree', 'TakeOwnership')  
        $acl = New-Object System.Security.AccessControl.RegistrySecurity
        $acl.SetOwner($sid)
        $regKey.SetAccessControl($acl)

        # enable inheritance
        $acl.SetAccessRuleProtection($false, $false)
        $regKey.SetAccessControl($acl)

        ### change permissions for top key and propagate it for subkeys
        if ($level -eq 0) {
            $regKey = $regKey.OpenSubKey('', 'ReadWriteSubTree', 'ChangePermissions')  
            $rule = New-Object System.Security.AccessControl.RegistryAccessRule($sid, 'FullControl', 'ContainerInherit', 'None', 'Allow')  
            $acl.ResetAccessRule($rule)
            $regKey.SetAccessControl($acl)
        }

        # dive into subkeys if recursion is on
        if ($recurse) {
            foreach($subKey in $regKey.OpenSubKey('').GetSubKeyNames()) {  
                & $adjustkey $root ("$key\$subKey") $sid $recurse ($level+1)  
            }
        }
    }

    & $adjustkey $root $key $sid $recurse
}



gci REGISTRY::HKEY_USERS -Name | ?{$_ -match '^S-1-5-21-\d+-\d+-\d+-\d+$'} | %{  
    Take-RegKeyOwnerShip -root Users -sid $_ -key "$_\SOFTWARE\fauligerkey"  
}