[SmG Battlefire]

So I shut down my computer. And it said it was installing a windows update. I was like what? I never asked an update. But I just went with the flow. So when I turned my computer back on, it was finishing the update. I than put my password. But after that, my whole screen is back. It does not show my desktop but the only gadget on my desktop. It still works. But I can't get to my start menu or anything.

You guys know what's wrong or how to fix this?