How to unlock the internal hard drive ?

[Doc Muerte]

I tried to install windows on boot camp but I ended up having the main hard drive locked up. It's on read only, I can't format it with the OS X install disc, and I can't launch OS X either, cause it cannot be found on it. Is there a way to fix it or am I doomed to give it to the tech support?

Oh and my friend said that I maybe reformatted it with boot camp to NTFS, that's why it's read only, but I have no idea.