Yeah man, do what Say Hi said... click on Window, the click AB Editing. That should open up all the windows you're used to.
Just be sure to drag all of your clips into the library (by default, it will be on your left-top corner with a file called "Bin" or "Bin 1").
Drag your clips there, as you can't drag clips directly to the timeline (which should appear across the bottom once you do the Window>AB Editing thing).
Let us know if this resolves the problem man.