Trojan Horse, help?

I did acer e-recovery.

Installed norton.

Plugged into internet.

Update windows, all good.

When it comes to updating to windows vista service pack 2, this came out.

When it's nearly done, 100%, it says : Auto-protect had detected Trojan-Horse.

What is happening? And when i click on "file insight",  and activity, it says that only administrator can view all threat details?

But i am the administrator. What is going on?

Thanks.

Message Edited by tanmx on 01-04-2010 06:56 AM