Norton toolbar affecting web layout on following page possible ?

I have suddenly got a problem with my web design. As you can see from the 2 screen dumps the Norton Toolbar is now affecting my page layout.  This does not happen on my laptop running exactly same OS and Chrome version, but on both me and my wife’s desktops (different desktop models) .

Here are the 2 links to screedumps : With Norton toolbar on top  and without the toolbar