Does this happen with every single click? I'm willing to bet that it's banner ad related, in all honesty. Also, what country are you from? (Helps to eliminate geotargeted campaigns only reaching the US, for example).
No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.