You have installed the Netbook edition by mistake. You can install the Desktop edition on top of this (there's no need to redownload and completely reinstall Ubuntu).
Open a terminal (by typing terminal in the text box at the top of the screenshot I gave you) and in the Terminal enter
sudo apt-get install ubuntu-desktop. (This will be a reasonably large download.)
Once this is finished, click on the Power icon in the top left and click on Log Out. Now click on your user name, then at the bottom of the screen select "Desktop" as opposed to "Netbook". Finally enter your password and press the Enter button.
You should now have a standard Ubuntu Desktop install.
If you want to remove the Netbook edition: again launch the terminal (from the standard Ubuntu interface you want Applications->Accessories->Terminal) and then enter
sudo apt-get remove ubuntu-netbook.