I have tried to install in laptop Windows7. Windows8 64bit version was already installed on the laptop. I created a recovery disk. Then, I inserted the disk of Windows7 at the laptop.However, the disk did not start. It was tried for the first time, it was confirmation of the security function.It was soon found. I found an item in BIOS. but it does not start yet. Then I tried. It was to see if oth