Is there a way to unlock a HD disc without erasing it?

I am trying to re-install Lion after making the ghastly mistake of messing with my HD permissions, completely messing up all my Sytem/library/extension/...Kext files, not that I understand what they are. Advice seemed to be that the best solution was to re-install OS, which for me is Lion !0.7.5 running on a iMac 24 inch, early 2009.
I followed the advice in this post:
https://discussions.apple.com/thread/3531813
That seemed to all go fine, until I get to the part to reinstall the OS, and the HD is unavailble since it is locked.
Any way to unlock it?
Feel free to dumb your answer way, way down and go through minute details is steps to follow.
Any help, much appreciated.
Cheers, and happy new year.

Mike,
Thanks so much for your reply.
Yeah, about a baker's dozen times.
I still can't reinstall Lion, back up HD is still locked, and now I think my hard drive has been erased, although that was't really my intention, but I keep trying different suggestions on DU, and that's what I think just happend.
I also can't seem to restore from Time Machine either, now.
Near tears.
Help?

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