How do i delete everything?

I have a copy of all the apps and everything, so i'm ready to get.. Except i don't know how. Like restoring your iDevice will delete all apps and files and totally reset everything. I want to do this with my Macbook7,1. I have Lion yes, but using the built-in recovery, i don't see any feature to delete everything and reinstall. And for some reason it says my Harddisk is "locked" using the feature deleteing and reinstalling Lion, but i guess that wouldn't delete everything, so Please help. I've heard that it could optimize my system and don't say it wont, just help me!

I'm having a very hard time understanding what you're trying to do, but I get the idea you're trying to erase the hard drive an reinstall a clean copy of the system.  There's really not much point to doing that if your system is working well right now, but as you said, I'll just help you and skip any further advice.
When you download Lion, the installer will open automatically.  If you let it run, it'll install and then auto-delete the installer, which is not what you want.  Follow these instructions to create a bootable Lion install disk:
http://www.macworld.com/article/161069/2011/07/make_a_bootable_lion_installer.ht ml
Use that to do the erase and install.

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