Unable to downgrade to win 8 Pro for Windows 7 Pro OEM

I just bought a new laptop from Sony with Windows 8 Professional pre-installed. I was under the impression that then I could downgrade to Windows 7 Pro. However when I try to do it by doing a clean install of Windows 7 Pro with a disc that I have, I get an error to the first restart during the installation. That is to say that the pilot is is not digitally signed.

I tried to turn off driver signing through settings-> General-> Advanced-> reboot and then disable it temporarily. Anything that allows me to do is to load Windows 8 again. Then if I restart or try to reinstall Windows 7, happening just to this old problem.
I also tried to activate test mode, but he had no chance.
What should I do to get this PC to Windows 7 Pro? All articles on the web look like the right to downgrade would be fairly easy to exercise. Thanks for any help.

Load the BIOS and disable Secure Boot, it is usually in the Section of the safety of your BIOS.

I suggest that you back up your installation of Windows 8 prior to the upgrade, just in case you want to revert to Windows 8 in the future:

http://techingiteasy.WordPress.com/2012/10/29/how-to-backup-your-Windows-8-installation/

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