download, install and run the 30 day trial of anti-trojan shield from click here it will inform you if you do actually have a trojan and where on your system it is hiding (though it won't actually remove it).
you need to install a firewall, click here for a free firewall which should stop any future hacking attempts
I get the smae message and I am pretty sure I do not have a Trojan on my system as have firewall, anti-virus and keep everyhting updated regularly. Even if you do have it on your system Norton seems to be doing a good job of blocking it so I wouldn't worry too much.
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