ASP.Net Com-InterOp WORD issue after hosting in windows server

I have created an API in C#(.Net framework) to convert Word to PDf using interop.word.dll. I have installed MS Office 2013 on the server. But no one is logged on the server I am getting the below exception

"Retrieving the COM class factory for component with CLSID {000209FF-0000-0000-C000-000000000046} failed due to the following error: 8000401a The server process could not be started because the configured identity is incorrect. Check the username and password. (Exception from HRESULT: 0x8000401A"

Does anyone have any solution for this?

Based on the suggestion given Microsoft forum.i have tried the following

In the command line put DCOMCNFG

Component Services -> Computers -> My Computer -> DCOM Config

1. Find "Microsoft Word 97 - 2003 Document" (If it is missing check if your Word is also 64 bit (if your Windows is) if it is not run mmc comexp.msc /32 instead of DCOMCNFG on step 1

Right click -> Properties

Go To Tab Security and Edit the "Customize" radio buttons so that IIS_IUSRS could have rights for launch and access

Go to Tab Identity and choose "The interactive user"

STILL NO HOPE .

It failed when user logged out from remote connection.