Problems accessing the Running Object Table

Question

In my program I use the Running Object Table (ROT) to ensure only one instance of my program is running. Since I \"inherit\" that code from a developer who unfortunately lef

Answer 1

From this site it appears it could be due to a registry setting or due to the security settings on an object registered in the table:

           Check "HKLM\Software\Network OLE\Enabled". Fail the    
           request if zero.                                       

           Check "HKCU\Software\Network OLE\Enabled". Fail the        
           request if zero.                                           
           Before performing any operation against a ROT entry        
           (i.e., IRunningObjectTable::Revoke,                        
           IRunningObjectTable::IsRunning,                            
           IRunningObjectTable::GetObject,                            
           IRunningObjectTable::NoteTimeChange,                       
           IRunningObjectTable::GetTimeOfLastChange, or when          
           including an entry in an IEnumMoniker::Next of an          
           IEnumMoniker returned from                                 
           IRunningObjectTable::EnumRunning), check the call against  
           the SECURITY_DESCRIPTOR available from                     
           IRunningObjectTable::Register. This will be either the     
           value returned by the object's                             
           IActivationSecurity::GetSecurityDescriptor at the time of  
           IRunningObjectTable::Register or will have been taken      
           from "HKCU\Software\Network OLE\DefaultROTSecurity" or     
           "HKLM\Software\Network OLE\DefaultROTSecurity" at the      
           time of IRunningObjectTable::Register if the object did    
           not support IActivationSecurity.