I notice something is different from your screen shot, why is the exit (X), Maximize, Minimize buttons is on the left side ? first time I see this.
Any way, I assume that you are using Firefox. Right click in the green area to the right of the buttons mentioned above, and check on Menu Bar. From the Menu, click on Tools->Options->General. What do you see your Home Page is set to ?
Again, from Menu click on Tools->Add-ons , you should see a list of Add-ons. Disable them all and restart Firefox and let us know how it goes.