How to downgrade from windows 10 Technical preview to Windows 7.

Hello, Last month -around 45 days ago- I proceeded to install Windows 10 Pro insider Preview build 10130, It was successfully installed, But days after day, I found some points that i didnt like about windows 10, I decided to go back to windows 7 (My old OS), I Tried going to the recovery tool, But no 'go back to windows 7' Poped up.
I really need to go back to windows 7. But i can't, I tried switching "At Start-up" Settings from windows 10 to windows 7, But It only showed windows 7.
Is there a possible way to get back to my windows 7?
Would it be possible to go back to windows 7 if i proceed to install the Full version of windows 10?
Please this full and answer.
Thank you very much.