I picked up the Conficker worm whilst at LINX64 yesterday. I’m pretty sure I was one of the few Microsoft users in the audience of out and out geeks so I know not whence it came.
My virus checker caught it, or at least told me it was there. This morning I gave my machine a complete set of security updates and it is now clean.
This is not an easy worm to remove. You can use a free tool provided by Symantec at this location. The Microsoft update that patches the vulnerability is at this location.