try selecting an object in your outliner and hit f.
it might have something to do with your camera's clipping plane - again, select in teh outliner and hit ctrl a for the attribute editor to adjust.
you could also try creating a new camera and see if that helps.
last, have you actually made anything yet? try creating a cube and again hit f just to make sure.
were you able to see objects in your outliner before? if not, then it may be a graphics card issue. try updating your drivers.
hope that helps.