I just downloaded TDS for evaluation and ran it. It found DDos.RAT in explorer.exe in my Windows folder. I was stunned. It must have been there for a long time, from back when I connected directly to my cable modem. I've used other programs to scan for trojans and none found this. I had noticed explorer.exe in my startup and thought that was odd, but MS often does things oddly. I checked my firewall and confirmed that I had blocked explorer.exe from calling out when it tried. At the time, I thought it was one of those many calls home that MS programs make, or try to make. So as soon as I get my tax return, I'm registering TDS.