I split your post off and moved it to the off topic folder, since this forum is for Windows Live OneCare and the thread you posted to is indeed about a real update issue with OneCare - http://onecare.live.com
What you apparently encountered and fell for is malware, masquerading as a legitimate update or product.
And you really need to remove one of your antivirus products, as having two - Norton and AVG - will potentially make the system less secure and may cause system instability.
-steve