Mountian Lion Install Problems ?

Hi last night i backed everything to a harddrive manually i didn't use time capsule that was my first mistake then secondly i booted into CMD+R From there i formatted my harddisk as i needed a clean install second mistake.... Now i got no OSX Mountain Lion installed on my mac book pro and every time i click to install Mountain Lion it fails on the eligbility check..... Also it says mountain lion preview 3 top left of the home page of disk utility..... Also i do have Mountain lion on dvd witch i got of my mate ages ago i think its the preview disk im not sure.. So my question is how do i reinstall OSX Moutian Lion ???

What year was your Mac made? If it is a newer unit that came with either Lion or Mountain Lion Pre-Installed then you can use the Online Internet Recovery system to install the original version of OS X that came Pre-Installed on your system.
For some unknown reason it seems that your internal Recovery HD partition, if that is what you used to reinstall MT Lion, is pointing to some type of Pre-Release Beta version as the Preview 3 tag is displayed.
If you used that DVD your Mate gave you then that is the reason.
In any event you will need to start over.
As to not using TM there is no reason to use TM if you don't want to. If you did use it and restored from it you would be back to where you started and NOT have a Clean install.
And doing a Clean install is a good proactice if you install and remove/uninstall programs all the time. Even with OS X everytime you install then remove a program you may leave droplets of that program someplace on the drive in the form of .plist files and or some kinds of files.

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