the firewall which u are using is really a good one and also u have locked the traffic so there is nothing to worry...let him try if at all he is really trying for u , he can do nothing ...as far as your firewall is there...

still i recommand u to scan your system for trojans at least once every week.....u will not find any trojans as far as your firewall is working properly..but...still....
u see ......."precaution is better then cure"


intruder.....