How to detect antivirus installed on windows 2003 server and 2008 server 2003 server

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i have used WMI to detect that antivirus is present on OS, itz woking fine and display me information of antivirus like name and instance id on win xp and window7 by using Namespace:\root\SecurityCenter and \root\SecurityCenter, \root\Security.

Code:

if(isHLOSVersion( ))

 hres = pLoc->ConnectServer( _bstr_t(L"root\\SecurityCenter2"),
 // Object path of SecurityCenter 

 NULL,                    // User name. NULL = current user 

         NULL,                    // User password. NULL = current 

         0,                       // Locale. NULL indicates current 

         NULL,                    // Security flags. 

         0,                       // Authority (e.g. Kerberos) 

         0,                       // Context object  

         &pSvc                    // pointer to IWbemServices proxy 

         ); 
 else
  hres = pLoc->ConnectServer( _bstr_t(L"root\\SecurityCenter"),
 // Object path of SecurityCenter 

   NULL,                    // User name. NULL = current user 

         NULL,                    // User password. NULL = current 

         0,                       // Locale. NULL indicates current 

         NULL,                    // Security flags. 

         0,                       // Authority (e.g. Kerberos) 

         0,                       // Context object  

         &pSvc                    // pointer to IWbemServices proxy 

         ); 

But in case of windows 2003 server and 2008 server 2003 server R2and 2008 server R2 these above namespace are not present so this is not working there.

Please let me know how can we detect that antivirus present or not windows 2003 server and 2008 server 2003 server R2and 2008 server R2 operating system.