[Débutant] Requested registry access is not allowed.

Bonjour,
Voici mon code pour accéder à la Registry à distance :

Mon environnement est Windows 7 SP1 64bit.

Je n'ai aucun problème quand j'utilise WMI pour obtenir les services, process, etc.

Qu'est-ce qui m'échappe ?? Merci

Code:

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 ConnectionOptions oConn = new ConnectionOptions();
                    oConn.Username = strAdmin;
                    oConn.Password = strPwd;
                    oConn.Impersonation = ImpersonationLevel.Impersonate;
                    oConn.Authentication = AuthenticationLevel.Default;
                    oConn.Authority = "ntlmdomain:mon domaine";
                    ManagementScope scope = new ManagementScope("\\\\" + lbPCName.Text + "\\root\\default", oConn);
                    ManagementClass registry = new ManagementClass(scope, new ManagementPath("StdRegProv"), null);
                    scope.Connect();

                    if (is64bit)
                    {
                        RegistryKey strKey64bit = RegistryKey.OpenRemoteBaseKey(Microsoft.Win32.RegistryHive.LocalMachine, "\\\\" + lbPCName.Text, RegistryView.Registry64);
                        strKey64bit = strKey64bit.OpenSubKey(RegRunKey64);   

                        if (strKey64bit != null)
                        {
                            foreach (string regkey in strKey64bit.GetValueNames())
                            {
                                AddDataGridView(dataRunKey, regkey, strKey64bit.GetValue(regkey).ToString(), row);
                                row++;
                            }
                        }