PowerShellでのレジストリアクセス権取得

PowerShellでのレジストリアクセス権取得が出来なくて困っております。

レジストリキーの内、所有者がtrustedinstallerになっているものについて編集しようとした際、アクセス権で弾かれるのでアクセス権を取得しようと、下記ページのanswerに書いてある関数を試しました。
リンク内容

しかし、最初の$keyの取得でsecurity exceptionが発生し、失敗してしまいます。
当方ではこれ以上は対処法がわかりませんでした。
わかる方よろしくお願いします。

追記
試した関数

PowerShell
1
2function enable-privilege {
3 param(
4  ## The privilege to adjust. This set is taken from
5  ## http://msdn.microsoft.com/en-us/library/bb530716(VS.85).aspx
6  [ValidateSet(
7   "SeAssignPrimaryTokenPrivilege", "SeAuditPrivilege", "SeBackupPrivilege",
8   "SeChangeNotifyPrivilege", "SeCreateGlobalPrivilege", "SeCreatePagefilePrivilege",
9   "SeCreatePermanentPrivilege", "SeCreateSymbolicLinkPrivilege", "SeCreateTokenPrivilege",
10   "SeDebugPrivilege", "SeEnableDelegationPrivilege", "SeImpersonatePrivilege", "SeIncreaseBasePriorityPrivilege",
11   "SeIncreaseQuotaPrivilege", "SeIncreaseWorkingSetPrivilege", "SeLoadDriverPrivilege",
12   "SeLockMemoryPrivilege", "SeMachineAccountPrivilege", "SeManageVolumePrivilege",
13   "SeProfileSingleProcessPrivilege", "SeRelabelPrivilege", "SeRemoteShutdownPrivilege",
14   "SeRestorePrivilege", "SeSecurityPrivilege", "SeShutdownPrivilege", "SeSyncAgentPrivilege",
15   "SeSystemEnvironmentPrivilege", "SeSystemProfilePrivilege", "SeSystemtimePrivilege",
16   "SeTakeOwnershipPrivilege", "SeTcbPrivilege", "SeTimeZonePrivilege", "SeTrustedCredManAccessPrivilege",
17   "SeUndockPrivilege", "SeUnsolicitedInputPrivilege")]
18  $Privilege,
19  ## The process on which to adjust the privilege. Defaults to the current process.
20  $ProcessId = $pid,
21  ## Switch to disable the privilege, rather than enable it.
22  [Switch] $Disable
23 )
24
25 ## Taken from P/Invoke.NET with minor adjustments.
26 $definition = @'
27 using System;
28 using System.Runtime.InteropServices;
29  
30 public class AdjPriv
31 {
32  [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
33  internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall,
34   ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);
35  
36  [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
37  internal static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr phtok);
38  [DllImport("advapi32.dll", SetLastError = true)]
39  internal static extern bool LookupPrivilegeValue(string host, string name, ref long pluid);
40  [StructLayout(LayoutKind.Sequential, Pack = 1)]
41  internal struct TokPriv1Luid
42  {
43   public int Count;
44   public long Luid;
45   public int Attr;
46  }
47  
48  internal const int SE_PRIVILEGE_ENABLED = 0x00000002;
49  internal const int SE_PRIVILEGE_DISABLED = 0x00000000;
50  internal const int TOKEN_QUERY = 0x00000008;
51  internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
52  public static bool EnablePrivilege(long processHandle, string privilege, bool disable)
53  {
54   bool retVal;
55   TokPriv1Luid tp;
56   IntPtr hproc = new IntPtr(processHandle);
57   IntPtr htok = IntPtr.Zero;
58   retVal = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);
59   tp.Count = 1;
60   tp.Luid = 0;
61   if(disable)
62   {
63    tp.Attr = SE_PRIVILEGE_DISABLED;
64   }
65   else
66   {
67    tp.Attr = SE_PRIVILEGE_ENABLED;
68   }
69   retVal = LookupPrivilegeValue(null, privilege, ref tp.Luid);
70   retVal = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);
71   return retVal;
72  }
73 }
74'@
75
76 $processHandle = (Get-Process -id $ProcessId).Handle
77 $type = Add-Type $definition -PassThru
78 $type[0]::EnablePrivilege($processHandle, $Privilege, $Disable)
79}
80
81enable-privilege SeTakeOwnershipPrivilege 
82$key = [Microsoft.Win32.Registry]::LocalMachine.OpenSubKey("SOFTWARE\powertoe",[Microsoft.Win32.RegistryKeyPermissionCheck]::ReadWriteSubTree,[System.Security.AccessControl.RegistryRights]::takeownership)
83# You must get a blank acl for the key b/c you do not currently have access
84$acl = $key.GetAccessControl([System.Security.AccessControl.AccessControlSections]::None)
85$me = [System.Security.Principal.NTAccount]"t-alien\tome"
86$acl.SetOwner($me)
87$key.SetAccessControl($acl)
88
89# After you have set owner you need to get the acl with the perms so you can modify it.
90$acl = $key.GetAccessControl()
91$rule = New-Object System.Security.AccessControl.RegistryAccessRule ("T-Alien\Tome","FullControl","Allow")
92$acl.SetAccessRule($rule)
93$key.SetAccessControl($acl)
94
95$key.Close()
96

目的
無人スリープタイムアウトを無効にするため
'HKLM:\SYSTEM\ControlSet001\Control\Power\User\PowerSchemes\381b4222-f694-41f0-9685-ff5bb260df2e\238c9fa8-0aad-41ed-83f4-97be242c8f20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0'
のキーを編集しようとしています。
多数のマシンを設定するのでコマンドでの実行が必須の状況です。