I can see a lot of errors about DCOM in Event log:
Event Type: Error
Event Source: DCOM
Event Category: None
Event ID: 10016
Date: 1/25/2008
Time: 2:57:46 PM
User: EVDOMAIN\evuser
Computer: ALTCLNT1
Description:
The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID
{F4D3EB5B-C7C5-11D1-90DB-0000F879BE6A}
to the user EVDOMAIN\evuser SID (S-1-5-21-2460365582-3136636228-3252893032-1120). This security permission can be modified using the Component Services administrative tool.
and there are also :
Event Type: Error
Event Source: Enterprise Vault
Event Category: Storage Server
Event ID: 4190
Date: 1/25/2008
Time: 1:38:04 PM
User: N/A
Computer: ALTCLNT1
Description:
An error occurred in the thread control of the Enterprise Vault .NET server processes
Error: <0x80131040>
Reference: LSM/cci
Additional Info: KVS.EnterpriseVault.SystemServerManager