Gnome desktop after software update

[Harry van Rijn]

After I made a software update for Fedora 17, the Gnome desktop has 
changed afterwards.
In my previous desktop there was a favourites bar, an Activities item 
and so on.
Now this all disappeared and I have the 'classical' desktop with an 
'Applications' and 'Locations' item.
I want the prevuous desktop with the favourites, Activites ... back.
How?