Well, after nearly four hours of searching, reading and running strange programs, I think I've rid myself of that nasty virus. I was able to install Spybot, Avast and ZoneAlarm again and have all three running.
My registry is newly cleaned and everything is reporting no problems.
Thanks, Aunt Edna, for all of the good juju.
Now if I could just reach the necks of those asshole virus writers...
