There is a problem with the headers of the page. Look at this:
Can you explain what the problem is? The image is so small it is impossible to see any problem 
right-click the image → View Image
Open the image in a new tab. You should see it better:
there is a piece of the page wider than others!
I can see it now That problem doesn’t show up under Windows XP. Maybe it’s a Vista specific problem? Can anyone confirm this?
Hi @Michele1,
Please file a bug report and provide as much information as possible. The QA team will be happy to help you triage this issue in the bugtracker.
Thanks!