All of a sudden when I am online and switch from one site to another some web pages open in the bottom tool bar. They are things like "Win £500 of Tesco vouchers" ect. They all seem to have the same multi coloured logo in the corner. I would like to stop them as after a short time as many as 10 may have opened. I have done My best in trying to explain this problem but please accept my appologies if I have not explained it too well!