Need Help : Windows Security

I am working on Windows based application and we have requirement to create folders/files in the local drive. I am using the below code to provide permission to the specified folder.  The code is working fine in Windows XP and the same thing is not working in Windows 7 OS.

It is throwing exception  Attempted to perform an unauthorized operation for the below code.

1)

// retrieving the directory information              

DirectoryInfo directoryInfo = new DirectoryInfo(folderName);

                                

DirectorySecurity directorySecurity = directoryInfo.GetAccessControl();

                                                

// myDirectorySecurity.AddAccessRule(new FileSystemAccessRule(User, FileSystemRights.ReadAndExecute, AccessControlType.Allow));

directorySecurity.AddAccessRule(new FileSystemAccessRule("Everyone",

FileSystemRights.FullControl,

InheritanceFlags.ObjectInherit | InheritanceFlags.ContainerInherit,

PropagationFlags.InheritOnly, AccessControlType.Allow));

                

// Set the new access settings. 

directoryInfo.SetAccessControl(directorySecurity);

If I use below code getting exception Some or all identity references could not be translated.

string User = System.Environment.MachineName + @"\Users";          

directorySecurity.AddAccessRule(new FileSystemAccessRule(User, FileSystemRights.ReadAndExecute, AccessControlType.Allow));

2) Second requirement is , I need to Start/Stop the some windows services programmatically, I am getting exception Cannot open Tomcat6 service on computer '.'

    This also using the OS Windows 7.

ServiceController service = new ServiceController(serviceName);

service.Start ();

Kindly reply to me if anyone can resolve this issue

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