What's up with the useless comments from some users? Stop that, it's not appreciated i think.
The addon is SLDT,
http://www.wowinterface.com/download...9139-SLDT.html
If you type "/sldt config", a config will pop up and you will be able to navigate to the "profiles" section and select a proper profile for the addon. If there's a lot of profiles to choose from, just select one after another until it looks like one of the screenshots of the UI.
However, there seems to be a lot of addons that aint properly installed. My advice is to redo the whole installation process, and follow is instructional video of how to install the UI carefully.
Good luck!