Ok well mostly to David but i thought id let you no again relating the ad's, pop ups etc.
I read a thread that you changed to google ad's, not 'too' sure what that means, well that it changes something or however, but when i used IE for CF the other day, i got more pop ups, but they were diffrent and i got something diffrent it was one of those download notice..thingys? I cant explain what they are maybe someone else does and all but it asks you if you want to download something, the one where its like flash, but this was not, it was one of the ones ive had before and even when you click "No" it downloads a Trojan! and from what ive noiced before(its not the first time ive seen it) its the "Generic type of trojan"..anyways heres a screen shot from the virus vault on AVG..
(sorry its messy)