MacBook problem! How to fix?

I have had my MacBook for about a year and yesterday the dock suddenly disappeared. Then I tried to restart and shut it down but the logout timed out. I tried to log out, but same problem. The only way I get it to work and get on the internet is by inserting a CD (because the tool bar at the top disappeared,) and then I click on the apple icon and find Safari, but it's annoying.. and I really don't want to have to go to the Apple Store, so any help, please!

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