Reinstalling OS X on Macbook pro HD

I' m having some problems fixing my MBP, i'm getting into recovery HD too try to erase the whole HD and reinstal OS X, the disk utility says that it's no possible to unmount the disk, since the current OS X is not booting, i backed up all my important files through my Windows partition into my pen drive, so i don't mind erasing the whole HD, even i tried to re install OS X Mavericks  from Recovery HD but both partitions (Macinstosh HD and Bootcamp) are locked. Can't repair the disk, can't erase it, neither reinstall OS X ,so i don't know what to do, any hep.
It's a MBP late 2011.
Just one HD.

Boot the MBP holding the OPTION COMMAND R keys down.  This should result in a display showing the world spinning.  Select the Internet connection and this should get you to the Apple servers.  It will allow you to install the original OS (not Mavericks).
Ciao.

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