i do not have any assets

i dont have most of them (i have a folder for fonts and "new terrain" in the standard assets) i have reinstalled the program twice.

i am new to the program so i dont have any idea what is going.

can anyone help

The bottom of this page tells you where to find them, on either OS.

http://unity3d.com/support/documentation/Manual/HOWTO-InstallStandardAssets.html

You have to make your own assets.

Unity comes with some packages that you can import when you make a new project, or go to Assets -> Import Package and then import the premade packages (they are installed in the unity installation directory).