UnauthorizedAccessException?

Question

Hi,
   Ive been developing a WMI based application for use within a domain. But I'm having issues with a workstation in my test environment, the code works fine checking a Windows 2003 Server from my XP SP2 machine(and vice-versa), but fails on another SP2 workstation(a fresh install running inside a virtual machine on the server) trigging this exception. Ofcourse I could handle the exception but the application would be useless.

 The code that triggers the exception is below(when the connection is first used. x being the name of a datarow):
                             

   System.Management.ManagementObjectSearcher searcher2 =

                                        new System.Management.ManagementObjectSearcher("\\\\" + x.Hostname + "\\root\\CIMV2",
                                        "SELECT * FROM Win32_ComputerSystem");

                                foreach (System.Management.ManagementObject queryObj in searcher2.Get())
                                {
                                    x.Processor_Number = queryObj["NumberOfProcessors"].ToString();
                                }

The WMI Code Creator (from microsoft) also triggers an access denied method when used remotely so I think this is a machine-centric issue.
The account the application is run from is a Domain wide admin, and the workstation has all the remote options ticked on the System, remote tab, has all of the RPC/NTLM authentication and WMI services set on automatic and running and has the firewall turned off. Are there any more options or services that need to be running?

Thanks