RPC_E_DISCONNECTED opening Acrobat in .NET

Type AcroExch_App = Type.GetTypeFromProgID("AcroExch.App");
Acrobat.CAcroApp _acroExchApp = (Acrobat.CAcroApp)Activator.CreateInstance(AcroExch_App);

I got RPC_E_DISCONNECTED error intermittently in my .NET code when trying to open Acrobat from the code above. The error is

The object invoked has disconnected from its clients. (Exception from HRESULT: 0x80010108 (RPC_E_DISCONNECTED))

My application is running on Windows 7. And I want to mention that I did found on Microsoft support site some hot fixes for the RPC_E_DISCONNECTED issue, but none are for Windows 7. Your answers and suggestions are greatly appreciated.