The latest culprit to spring up on this forum is 
a pop-up window that leads to xzoomy.com and 
apparently tries to self-install some cr@p on to 
your computer.  Closing that window opens up 
another window.

Fortunately, I took the very wise advice of 
someone else on this board and placed 
animanga.com in my Restricted Sites zone.  So 
all that happened to me (I hope) were the 
windows; nothing seemed to install.

Anyway, something for you to investigate again.