i have some suggestions to help reap some info.

Active Ports, Smartline, inc.
http://www.majorgeeks.com/article.php?sid=682
this one should show all open ports on the machine

Adaware, Lavasoft
http://www.lavasoftusa.com/
should identify anything nw added to registry etc.

Trojan Remover
http://www.simplysup.com/
should find things that look like trojans CAUTION: may find things that are not trojans

hope this helps…