Certified toolbar - how to remove it from Mozilla?

Hi,

I am new here. Don't know if my post is in the right place but... Whenever I open my internet browser, it gets redirected to some Search.certified-toolbar.com. I googled about it and since I do not want to remove the problem manually I found this link telling about automatic removal: http://www.2-viruses.com/remove-search-certified-toolbar-com-hijacker. But it's a paid software therefore I want to consult regarding it before paying for. What tools can remove that irritating redirection? Has anyone tried Spyhunter? Please explain as simple as possible. I am not a computer geek :-o