Hi,
This could be related to DCOM permissions:
Checking DCOM settings
The last place to check rights on a computer is in its DCOM settings.
To verify Distributed COM properties
1. On the Windows taskbar, click Start > Run.
2. Type the following, and then click OK:
dcomcnfg
3. Do one of the following, depending on your operating system:
* In Windows XP/2003, click Component Services > Computers > My Computer. Then right-click My Computer and click Properties.
* In all other versions of Windows, go on to the next step.
4. On the Default Security or Default COM Security tab, under Default Access Permissions, click Edit Default.
5. Verify that Administrators, Interactive, and System accounts are set to Allow Access, and then click OK.
6. Under Default Launch Permissions, click Edit Default.
7. Verify that the Administrators, Interactive, and System accounts are set to Allow Launch, and click OK.
8. Do one of the following, depending on your operating system:
* In Windows XP/2003, skip the two following steps.
* In all other versions of Windows, go on to the next step.
9. In the Default Configuration Permissions section, click Edit Default.
10. In the Registry Key Permissions window, verify that the following are set to Full Control, and then click OK:
CREATOR OWNER
...\Administrators
SYSTEM
11. On the Default Properties tab, verify that Default Impersonation Level is set to Identify.
12. Click Apply, and then click OK.
13. Restart the computer for the changes to take effect.
Troubleshooting Symantec AntiVirus Corporate Edition installations: Checking rights and permissions
http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/3f862957b21b671588256c620077a200?OpenDocument
Is DCOM enabled?
http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/8068682cee4e7f7088257536006ac6fe?OpenDocument