Have a look here:
Hope it helps
I work away from home, and it would appear that some time ago my daughter, using the home PC, allowed in a Virus or Trojan, despite the PC having Norton AntiVirus 2004 and the Firewall. My attempts to get rid of the virus each time I go home have been frustrated, there isn't much on the Symantec Web site to help in identifying the virus - hopefully somebody here will recognise the Symptoms:
The message upon trying to connect to any Web page is:
"Forbidden: You were denied access because: Access denied by Access Control List". The default for allowing a remote program to access the PC has been changed to "Permit", and can't be changed back to Block.
Intelligent updater (with the latest definitions being taken home with me) won't work, as the virus issue the false message that the subscription has expired (it runs until December 2005). The Virus checking panel for Norton Virus has "Check for viruses and Trojans" blocked out. The PC can't be booted in safe mode. Running the virus scan from using the Norton disk as a boot disk doesn't discover anything - trying to /dump the latest virus definitions for the CD to use upon booting up falls foul of the "subscription expired" interception.
The infection probably took place early January 2005. First thing I tried was taking home the 10 latest virus removal .exes from the Symantec Web site - whatever the infection is, it isn't one of those. Re-installing Norton didn't work, so I'm rather snookered.
I'm hoping that somebody reading this Post will immediately recognise the Virus/Trojan from the description. I can then get rid of it this time, when I return home in a fortnight (I have a laptop here).