if you're getting coolwebsearch you can use cwshredder.
Usually if norton can't remove something but CAN detect it then there's an active registry key. Write down the path to the trojan and reboot in safe mode so only critical keys are active, then use windows explorer to delete it. Also, if you aren't already using windows antispyware beta (free) you can give that a try...does a nice job of getting rid of stuff with active reg keys since its a MS product
