deftones get your self a copy of fport. see what has ports opened on your box as has been pointed out this infection seems to use an irc client as well, many do. see if one is operating on your machine. tftp server, irc client...? i imagine you've already done a virus scan with updated definitions, some worms delete themselves after they install none virus type software, like an irc client and tftp server.
is your computer is making attempts to tftp something onto your computer chances are you're at least partially infected. post your findings