Cannot reinstall Lion or Repair the disk cause the disk is locked

Hello,
I just tried to use my MacBook pro but its showing a loading bar and it loads for like 5% and then shuts down.
I read the instruction booklet and it says that I should tried to repair the disk or reinstall Lion but when I tried to repair it stops the process and when I try to reinstall its telling me that the disk is Locked!!!
HELP!!! Whats the next step?

Next step - Apple store or AASP.

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