electric ghost 0 Newbie Poster

hi i keep getting loads of nasty tracking cookies on my laptop, atdmt[1].txt, and others! After I made the mistake of letting MyWebSearch on here, which is verratious(!!!) and made its own passsword so that i can't get rid of the whole thing. I managed to get rid of its internal files so that it can't load. But now i'm getting alot of other tracking cookies. Everyday there's some new ones(always multiple new ones!) and no matter how many times i get rid of them the same ones still appear the nexy day, and none of my firewalls etc will block them for some reason(?). Does any one know how to help me to be rid of them for ever, as the are changing my settings, slowing my laptop, and causing other problems like page loading errors! Or does it sound like there is something very well hidden on here? Please Help!
Thanks