In my extremely limited understanding of computers, I think what is happening is that when you first visit this website on a given day, you download certain temp files. (Like gif files of the grey lines and black lines that are the page templates lets say). One of those is now a rogue file that is trying to access Adobe Reader. It is being stopped by the anti-Virus programs on people's computers though.

Maybe someone who knows better what they are talking about though can add to this.