Need help from BT experts

I am using Bit Comets to download R2K's videos. Since the day before yesterday, I initiated a download request for Mar 19 Hornets game. 24 hours later (around 8 hours ago) I checked the progress and noticed from R2K's tracker that no one was seeding and my BT client recorded 0% downloaded.

This morning (HK time), 8 hours later, I checked the progress again and found that my client was actually uploading something to the net while downloading nothing. I was kinda shocked as I started ONE task in Bit Comets only. I checked Windows Network Connection and found that my PC has in fact uploaded over 1GB of data to the network during the past 8 hours!

Bit Comets reflected the uploaded activity (there was a small icon showing how many bytes were uploading and downloading at that moment) but I cannot tell from its interface what data was uploaded. Anyone know how to trace the activity (i.e. what files were transferred during certain period of time) under Bit Comets?

I used ZoneAlarm and WinPatrol to safeguard the PC and I know there could be some other trojans invaded my PC. Any suggestion for a powerful scanner?

Many thanks for your help.

Oh, and sorry for the lousy English.