The icons up the top aka dock, is RocketDock which can be downloaded from the below link. About RocketDock - RocketDock.com
Those particular icons are from an icon pack called Frost Icons
.Other icons and addons can be found below. Get Icons - RocketDock.com
The bars on either side of the desktop are a little app called Rainmeter which can be downloaded below. The theme I am using is Enigma
which comes with Rainmeter. Rainmeter, desktop customization tool
Your taskbar icons can be changed using the below tutorial... Taskbar Pinned Icons - Change
...as can your Start button using the below tutorial. Start Menu Button - Change
Well, that's it.