Why does the wrong stuff pop up when doing searches?

It is pretty anoying, when I do a search on google the wrong stuff keeps popping up, the main headlines pop up correctly but when I pick one and click it something totally wronk pops up, it has been doing it for about a week now, it seems like it started doing it around the same time I downloaded instant messanger, I am not sure if it has anything to do with that but it happened around the same time.

Thanks for any help,
Doug