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The signature feature of Windows 7 is its redesigned taskbar, which allows you to pin programs and files so you can have quick access to them any time you want.
So, naturally, someone at Sony decided that the perfect complement to the taskbar on the bottom of the screen is a separate dock/toolbar at the top of the screen. It's installed and enabled by default, ready to appear as soon as you accidentally bump the mouse pointer against the top of the screen. And some of the icons are actually folders that spawn secondary toolbars!
On the plus side, none of those icons are on the desktop...