All Windows Apps Gone! Even Store App doesn't work!

I just had my LCD screen replaced, and when I got my laptop back, I realized all apps were completely gone--the Start screen showed the background I selected, my picture, and nothing else. I used the "Refresh" option for Win 8, and that caused there to be two apps in the Start screen: Desktop and Store. The store app DOES NOT work. when I click on it, it flips like it's going to start, then it goes back to the start screen. Nothing at all happens. During the refresh, SEVERAL programs were deleted, including important-looking ones like "Settings" for my Samsung laptop and "Windows Driver Package - Samsung Electronics Co. Ltd", Windows Essentials, along with browsers, etc. How do I get the Store app to work so that I can re-download some of the other apps?

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