Excel 2013 "cannot use object linking and embedding error"

Hi

We are using excel export as pdf functionality and have the following DCOM configuration

1.start->run and type 'DCOMCNFG'

2: Open 'DCOM Config' and locate 'Microsoft Excel Application'

3: Set its identity to 'This User' and give specific service user

On opening excel  we are getting  "cannot use object linking and embedding error" and the microsoft sugestions tells to change to launching user which is not an option for us,Is there any other suggestion to fix this issue by keeping Dcom configuration with'This User'

Thanks in advance

Pradeep