Internet Security - Finding Someone On the Internet....How?!?

[The Pete]

My PC was previousily hacked into successfully in my old apartment. I
recently moved, bought a new computer (has Norton firewall) and now I
have the same intruder on my system. How does one hunt someone down
once they move residence, purchase a new PC, and have a new highspeed
Internet account?

 

[Gary S. Terhune]

Do you know what the intruder is? What's its name? The most likely answer to
your problem is that the intruder hitched a ride on one of your personal
files, or you deliberately installed something you think is good but in
reality is a fraud.