Your course of action depends on whether the Trojan has been executed.
If the Trojan has not been executed
If the Trojan has been executed
- Run LiveUpdate to make sure that you have the most recent virus definitions.
- Start Norton AntiVirus (NAV), and run a full system scan. Be sure that NAV is configured to scan all files.
- Delete all files that are detected as Trojan.JS.Offensive.
This is an extremely damaging Trojan. If it has been executed, you will not be able to run any programs, including Norton AntiVirus. To recover, you must:
- Delete the file that is identified as being infected with the Trojan. You will be able to do only this by booting from DOS (if your operating system permits this) and using a Rescue Disk set to remove the Trojan.
- Remove all of the registry values that the Trojan created. You will not be able to do this in Windows. The only way to remove the registry keys is by booting to a command prompt and making the changes from the command line. This is extremely difficult and time consuming, and is not recommended. As an alternative, you can restore the registry from a backup or reinstall Windows. You may need to obtain the services of a computer consultant.