Thanks for your answer, but:
1. Under Win2k8 those setting looks little different.
2. I used referenced document to check my DCOM settings:
DCOM->My Computer Properties:
Tab "Default Properties"
Enable Distributed COM on this Computer
Default Authentification Level: Connect
Default Impresionation Level: Identify
Tab "COM Security"
Access Permissions -> Edit Default
SELF, SYSTEM, Administrators(...\Administrators) and INTERACTIVE ALLOW
Launch and Activation Permissions -> Edit Default
SYSTEM, Administrators(...\Administrators) and INTERACTIVE ALLOW LAUNCH & ACTIVATION LOCAL & REMOTE
I still get the same error, even after restarting the server.