This utility resides in the system tray, it will be "listening and protecting" the ports which are commonly used to connect to your computer. In case of a possible connection, this utility will cache the ip address and then you may track down the person, even to phone number or email.
http://rapidshare.de/files/10643337/protectx.rar.html
Name: Nemesis
Standard Edition: 5ADFAC6EC25
Professional Edition: 5AD4AC5536AA261
http://www.plasmateksoftware.com/files/exes/protectx.exe
Name: Nemesis
Standard Edition: 5ADFAC6EC25