In short.... no. and what good would tracing his ip through a proxy do you anyway? Honestly not much at all.getting the log files with the help of law inforcement would be difficult at best if not impossable, without the help of law enforcement, damn near impossible. Firstly, do a full system scan with an updated antivirus. If he has planted any type of trojan, hopefully it will be found. Second, If your not going to change your nick in what ever forum this is occuring on, mabey you should consider dropping out of that forum for a while. Chances are this person will get bored and go away. Lastly, add them to your ignore list if the forum has that feature, most do. Mainly because any communication from you to them or about them is only going to encourage their activity. Trust me on that one.

<evil grin>You could always set up a second username and return the favor, drive them crazy by stalking them </evil grin> <<<--- Im joking of course.