Win32_ComputerSystem can not retrieve VM list in Server 2012 R2

Question

Below code use to work on Win2008 or 2012. Recently, I upgraded my system to WIn2012 R2, the ManagementObjectCollection will throw "invalid class" exception. Any clue to fix this?
ObjectQuery  query = new ObjectQuery("SELECT * FROM MsVM_ComputerSystem WHERE Caption LIKE 'Virtual%' ");
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(manScope, query))
ManagementObjectCollection collection = searcher.Get();
if (collection != null)
 foreach (ManagementObject obj in collection)

Answer 1

Hi,
Based on my research,
Network Location Awareness (NLA) service expects to be able to enumerate the
domain’s forest name to choose the right network profile for the connection. The service does this by calling
DsGetDcName on the forest root name and issuing an LDAP query on UDP port 389 to a root Domain Controller.
If something hinders the DNS name resolution or the connection attempt to the DC, NLA is not able to set the appropriate network profile on the connection.
Therefore, I suggest you check the DNS settings on DCs and other domain-joined machines, which should point to the existing DC as preferred DNS server, and secondary DC as alternate DNS server, IP address of demoted DC should be
removed. In addition, please do not use loopback IP address.
Here are some articles below I suggest you refer to:
Network Location Awareness (NLA) and how it relates to Windows Firewall Profiles
http://blogs.technet.com/b/networking/archive/2010/09/08/network-location-awareness-nla-and-how-it-relates-to-windows-firewall-profiles.aspx
Network Location Awareness
http://technet.microsoft.com/en-us/library/cc753545(v=WS.10).aspx
Complete Step by Step to Remove an Orphaned Domain controller
http://msmvps.com/blogs/acefekay/archive/2010/10/05/complete-step-by-step-to-remove-an-orphaned-domain-controller.aspx
Best Regards.
Amy