Trouble installing disk locked

Hi all,
I downloaded and attempted to install Mountain Lion. Unfortunately, it failed. The error says my disk is locked. I looked at my partitions, and I do not have any. I really need to use my machine, and feel pretty frustrated at this point. Can somebody help? Thanks!

Do a backup with Carbon Copy Cleaner in an external disk and open this to burn the installer in a DVD or USB > http://arstechnica.com/apple/2012/07/how-to-create-a-bootable-backup-mountain-li on-install-disk/
Press Option key and boot from the USB. Open Disk Utility, select the volume and erase it. Then, install Mountain Lion

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