Cant not see any objects in viewport

Every object I place in the view port shows up as a small grey square, it will then disappear once deselected.Unity was working fine then it just decided to do this. I have uninstalled it and reinstalled and get the same problem. I have updated my graphic drivers AFTER this problem occurred and it has not made a difference.

Example:http://www.omiles3d.com/error.jpg

Its rather vital that I find a solution this problem as a job offer may rely on it so any help would be very much appreciated.

I had what sounds like the same problem 2 days ago. Somehow, on the Layers dropdown (above the inspector, to the left of Layout), 'Default' had gone de-selected. It did this for many projects and scenes. I don't know why, but checking Default layer definitely fixed it for me.

thanks a lot. helped!!!=)