My computer is being used as a zombie and i need help

Today i received a letter from my ISP syaing that there has been a complaint about port scanning coming from someone in my network and that they will disable my broadband connection if I dont act. My network is small and it is mostly likely me. I have run TDS-3 Pro and have found that there are quite a few ports open for RAT trojans. All of the following trojans where detected and are using the ports to listen:

RAT: Back Door Setup, Blazer5, Bubbel, ICKiller, Sockets des Troie, Bionet Lite, Raid, Angel, G.R.O.B., Gaura

I have checked up on these and I can't find any of the files commonly associated with these trojans on my computer. But ports 5000, 1032 and 1025 all have trojans listening on them. Does anyone know of any way to get rid of these trojans and/or close these ports and/or trace these processes to their sources?

Refer to this thread - http://forums.windrivers.com/showthread.php?t=57348 - Any further problems, let us know.

Install a software firewall like zonealarm. It will ask you to verify each program's access to the internet.