firefox is hijack

Hello and thank you for your help
I think my computer is hijacked, I am the administrater of my home computer and when I open my browser, my home page loads, Yahoo, but if I click on a link it takes the new tab or window to some advertising site. I created a new user for me and made it the administrater, but same thing happened, I also changed one of the other users to admin. and now it does the same as mine.
I looked through what I know and ran spybot and adaware. They found a few problems but did not solve this problem. I even ran both of them at start up and i think spybot found something but it could not remove it, I don't remember what it was. So I ran Hijack this and here is my log
Thanks again Tom

 

any and all help is greatly appriciated
thank you TOM