If you say its a trojan but you don't know its name, you'd probably be at best scanning with your anti-virus software. Whether is it Norton or McAfee, you need to know what is going on with your computer. Check the logs of incoming files downloaded, you may not even know you downloaded the trojan yourself.
Norton has a tool which allows you to disallow internet access from a specific file or program. It's pretty useful because i set mine to always ask me if it can allow a file from my computer in or out. In any case, its a good idea to do a full scan with a spyware removal tool also because your normal anti-virus package may not have come with a full list of spyware definitions.
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