error while opening word document

Hi.. i am getting below error message while opening the word document
Retrieving the COM class factory for component with CLSID {00020906-0000-0000-C000-000000000046} failed due to the following error: 80080005 Server execution failed (Exception from HRESULT: 0x80080005 (CO_E_SERVER_EXEC_FAILURE)).
i also cheked my dcom permission..look like everything is fine..
 
here is my code
object fileName = Server.MapPath("2.doc");         object readOnly = false;         object isVisible = true;         object missing = System.Reflection.Missing.Value;         ApplicationClass oWordApp = new ApplicationClass();         Document oWordDoc = new Document();
        object oMissing = System.Reflection ...