How to downgrade 10.8 ML to 10.7 Lion, My Mac was pre-install with 10.7, and the Copy of M.L was not purchased for app store .

I am bit confuse, how to deal with it, somewhere i read that I should erase the Hardrive and use Internet recovery but not sure. If I reinsatll it form 10.8 Recovery disk it ask for apple ID , but I didn't purchase ML.

Great! Then it came with Lion pre-installed and all you have to do is Internet Recovery as mende1 pointed out. COMMAND+R+OPTION keys held until you see a spinning globe then you can erase the drive using OS X Utilities and Disk Utility then reinstall Lion from the OS X Utilities menu.
I'm running ML that I got from the App Store on a mid-2011 Mac Mini. Internet Recovery ALWAYS gives me the ability to reinstall Lion which is what was pre-installed.
You don't want to use the current Recovery HD which is Mountain Lion. You want to use Internet Recovery.

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