My fiance is being harrassed online by an unknown person. When she signs on to her paid AOL account and opens AIM this person attempt to chat with her.

A few things stand out as very very odd. First, she always logs on "invisible." Yet this person always knows when she is logged on to AIM. Second, this person's screename (trbl2u...I believe) is not an actual member of AOL. She called AOL to report this person, and two people there told her they have no record of that screename being in use.

How is this possible?

And how do you think we should handle this problem?

This has happened before. Difference is that back then the person's screename didn't even appear! She brought her laptop to a service professional and they did a clean install of XP. She has been very careful not to open emails from people she doesn't trust.

Please help?

Thank you.