process owner

[Bob Allen]

i am using the following code and it works great in a terminal service
environment until i log in as a non-admin.
if i log in as an admin it works fine but otherwise i get a null returned
from the "getowner" call. Any help is as always greatly appreciated.

string query = "Select * From Win32_Process Where ProcessID = " +
iProcessID;
ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
ManagementObjectCollection processList = searcher.Get();
foreach (ManagementObject obj in processList)
{
string[] argList = new string[] { string.Empty };
int returnVal = Convert.ToInt32(obj.InvokeMethod("GetOwner", argList));
if (returnVal == 0)
return argList[0];
}